I am trying to do rsh on one of my VM but getting connection refused error. I have checked /etc/hosts and /etc/resolv.conf both have proper hostname, IP and domain.

When I run command, rsh localhost pwd as a root It shows below output. connect to address 127.0.0.1 port 544: Connection refused Trying krb4 rsh... connect to address 127.0.0.1 port 544: Connection refused trying normal rsh (/usr/bin/rsh) rcmd: socket: Permission denied When I run the same command from normal user named service. Then it shows below output. connect to address 127.0.0.1 port 544: Connection refused Trying krb4 rsh... connect to address 127.0.0.1 port 544: Connection refused trying normal rsh (/usr/bin/rsh) /home/service Why this behavior happening?

I've never heard of the word rsh before, but I received a checklist from a security advisor that we have to "disable rsh". Can someone please tell me what rsh and how to disable it, please? We are using RHEL 5.5 and 5.6.

I want to launch Netscape Navigator The 6000 port on my host is open the host is added using xhost+ host + 192.168.0.33 If I did rlogin 192.168.0.33 and then export DISPLAY=192.168.0.2:0 navigator Works fine. But I want to run directly on host I have tried rsh 192.168.0.33 DISPLAY=192.168.0.2:0 navigator and DISPLAY=192.168.0.2:0 192.168.0.33 navigator and export DISPLAY=192.168.0.2:0 rsh 192.168.0.33 /usr/bin/navigator and rsh 192.168.0.33 "export DISPLAY=192.168.0.2:0 ; /usr/bin/navigator" But don't work Why? FAQ Q: Why not ssh which is simpler and more secure? A: This is an old host, ssh2 is not supported Q: Why use a very old browser? A: Is for turn on an old Bare-metal ibm server which use very old ssl protocols (ssl2, rc4 and other weak tools) for remote manage via ASMI , the modern browser has ssl3 and tls 1.1 disabled so cannot open a webpage "protected" using ssl2 Q: Why don't upgrade ASMI? A: This server is discontinued since 10-15 years

The setup: only a single server in the group is acessible via SSH. Others are accessible from the former via RSH only. So when I want to execut a command on other servers, I do this:

$ ssh asd10 rsh asd7 hostname
ASD7

Is it possible to combine this into ProxyCommand in the classical SSH jumphost way? > A configuration like this will allow you to proxy through HOST A. > >

> $ cat .ssh/config
> 
> Host host-a
>   User your_username
>   Hostname 10.0.0.5
> 
> Host host_b
>   User your_username
>   Hostname 192.168.0.1
>   Port 22  
>   ProxyCommand ssh -q -W %h:%p host-a
>

> > Now if you want to connect to your HOST B, all you have to type is ssh host_b ... so I could run:

$ ssh asd7 hostname
ASD7

? **[Supplemented]** If I go straightly like @cas asked:

$ ssh -t -o ProxyCommand='ssh asd10 rsh %h' asd7 hostname
tcgetattr: Invalid argument
ioctl TIOCGETP: Invalid argument
ioctl TIOCLGET: Invalid argument
ioctl TIOCGETC: Invalid argument
ioctl TIOCGLTC: Invalid argument
ioctl TIOCGETP: Invalid argument
ioctl TIOCLGET: Invalid argument
ioctl TIOCSLTC: Invalid argument
ioctl TIOCSETC: Invalid argument
ioctl TIOCSETN 3: Invalid argument
ioctl TIOCLSET: Invalid argument
Killed by signal 2.

... it stays in a loop until I press Ctrl-C. It probably waits for the input and then generates no output. I haven't used a working shell session in parallel to check if the former actually spawns any new processes.

I need to install rsh/rlogin services on a RHEL9 host. It looks like these services were removed from the distribution and also from EPEL. I know all the reasons not to install these, but I need to anyway. Is there a way I can do it?

I have searched a lot in various forums and most indicate that the solution is to open ports in the firewall or restart the xinetd service. Although that may be the solution in some cases, I think the problem is another and is still pending solution. I have Red Hat 6, iptables service is off, and I have not modified the executables rshd/rsh. Initially, when I start the system, rsh works fine: # rsh localhost pwd /root If I simply restart the service "xinetd", I get the known message "poll: protocol failure in circuit setup": # service xinetd restart Stopping xinetd: [ OK ] Starting xinetd: [ OK ] # rsh localhost pwd poll: protocol failure in circuit setup I have only been able to fix the problem in two ways: rebooting the system or going through level 2. # init 2; sleep 1; init 3 # rsh localhost pwd /root I'd like to reach the root cause. It is not a firewall problem. **This is the strace output when it fails:** (see highlighted passage)

socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
bind(3, {sa_family=AF_INET, sin_port=htons(1023), in_addr=inet_addr("0.0.0.0")}, 16) = 0
fcntl(3, F_SETOWN, 23277)               = 0
connect(3, {sa_family=AF_INET, sin_port=htons(514), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 4
bind(4, {sa_family=AF_INET, sin_port=htons(1022), sin_addr=inet_addr("0.0.0.0")}, 16) = 0
listen(4, 1)                            = 0
write(3, "1022\0", 5)                   = 5
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}], 2, -1) = 1 ([{fd=3, revents=POLLIN|POLLERR|POLLHUP}])
write(2, "poll: protocol failure in circui"..., 40) = 40
close(4)                                = 0
close(3)                                = 0
rt_sigprocmask(SIG_SETMASK, [], [URG], 8) = 0
exit_group(1)

**This is the strace output when it works fine:** (see highlighted passage)

socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
bind(3, {sa_family=AF_INET, sin_port=htons(1023), in_addr=inet_addr("0.0.0.0")}, 16) = 0
fcntl(3, F_SETOWN, 24718)               = 0
connect(3, {sa_family=AF_INET, sin_port=htons(514), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 4
bind(4, {sa_family=AF_INET, sin_port=htons(1022), sin_addr=inet_addr("0.0.0.0")}, 16) = 0
listen(4, 1)                            = 0
write(3, "1022\0", 5)                   = 5
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}], 2, -1) = 1 ([{fd=4, revents=POLLIN}])
accept(4, {sa_family=AF_INET, sin_port=htons(1020), in_addr=inet_addr("127.0.0.1")}, ) = 5
close(4)                                = 0
writev(3, [{"root\0", 5}, {"root\0", 5}, {"pwd\0", 4}], 3) = 14
read(3, "\0", 1)                        = 1
rt_sigprocmask(SIG_SETMASK, [], [URG], 8) = 0
setuid(0)                               = 0
rt_sigprocmask(SIG_BLOCK, [INT QUIT TERM], [], 8) = 0
rt_sigaction(SIGINT, {SIG_IGN, [INT], SA_RESTORER|SA_RESTART, 0x2abd2e3c1920}, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGINT, {0x2abd2db30080, [INT], SA_RESTORER|SA_RESTART, 0x2abd2e3c1920}, {SIG_IGN, [INT], SA_RESTORER|SA_RESTART, 0x2abd2e3c1920}, 8) = 0
rt_sigaction(SIGQUIT, {SIG_IGN, [QUIT], SA_RESTORER|SA_RESTART, 0x2abd2e3c1920}, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGQUIT, {0x2abd2db30080, [QUIT], SA_RESTORER|SA_RESTART, 0x2abd2e3c1920}, {SIG_IGN, [QUIT], SA_RESTORER|SA_RESTART, 0x2abd2e3c1920}, 8) = 0
rt_sigaction(SIGTERM, {SIG_IGN, [TERM], SA_RESTORER|SA_RESTART, 0x2abd2e3c1920}, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGTERM, {0x2abd2db30080, [TERM], SA_RESTORER|SA_RESTART, 0x2abd2e3c1920}, {SIG_IGN, [TERM], SA_RESTORER|SA_RESTART, 0x2abd2e3c1920}, 8) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2abd2eb893b0) = 24721
ioctl(5, FIONBIO, )                  = 0
ioctl(3, FIONBIO, )                  = 0
rt_sigprocmask(SIG_SETMASK, [], [INT QUIT TERM], 8) = 0
select(6, [3 5], NULL, NULL, NULL)      = 1 (in )
read(3, "/root\n", 8192)                = 6
write(1, "/root\n", 6)                  = 6
select(6, [3 5], NULL, NULL, NULL)      = 1 (in )
read(3, "", 8192)                       = 0
select(6, , NULL, NULL, NULL)        = 1 (in )
read(5, "", 8192)                       = 0
kill(24721, SIGKILL)                    = 0
exit_group(0)                           = ?

Thank you in advance for your help. Best regards, Octavio

In the starting rsh worked properly, but after making some changes it shows some error [changes are shown in the end of this question, see that], I am sharing the same. **Command** $ /usr/bin/rsh localhost ulimit -n **Output** poll: protocol failure in circuit setup After facing this problem, I followed this link , but didn't get any help. It works properly, but when I made some changes, from this link , then after that it shows the output as above. Now I revert all changes, but it shows the same output. Why? These are the lines that I added in files, showing in left hand side, by seeing the above link. /etc/pam.d/login: session required pam_limits.so /etc/pam.d/sshd: session required pam_limits.so /etc/pam.d/su: session required pam_limits.so /etc/pam.d/system-auth: session required pam_limits.so Here is the link of what I am trying to do. **Edit No. 1** strace -o log.txt rsh localhost pwd, some lines of output are as, connect(3, {sa_family=AF_INET, sin_port=htons(514), sin_addr=inet_addr("127.0.0.1")}, 16) = 0 socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 4 bind(4, {sa_family=AF_INET, sin_port=htons(1022), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 listen(4, 1) = 0 write(3, "1022\0", 5) = 5 poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}], 2, -1) = 1 ([{fd=3, revents=POLLIN|POLLERR|POLLHUP}]) write(2, "poll: protocol failure in circui"..., 40) = 40 close(4) = 0 close(3) = 0 rt_sigprocmask(SIG_SETMASK, [], [URG], 8) = 0 exit_group(1) **Edit no. 2** **Command** - strace ~/rshd.trace in.rshd **Output** execve("/usr/sbin/in.rshd", ["in.rshd"], [/* 22 vars */]) = 0 brk(0) = 0x2b3054ec2000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b303671d000 uname({sys="Linux", node="jhamb.XXX.XXX", ...}) = 0 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b303671e000 arch_prctl(ARCH_SET_FS, 0x2b303671e6d0) = 0 --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV +++

I am working on a project, that uses rsh utility for remote connection. But my project needs some extra features for that, so I add that features. Till now, all the things are going fine. But when I take a strace on rsh server. It shows that it opens and reads PAM modules and limits.conf. But the rsh, that I made is not able to open and read PAM module and limits.conf. I followed this link to check above things. Number of calling of PAM module and all these things are exactly same in Standard rsh and mine rsh. **The reasons that I think, behind this weird behavior** :- 1. May be configure file does not load by makefile of mine rsh. 2. May be it does not load MCONFIG , MRULES in makefile. But I didn't understand how can I confirm my doubt, and remove this problem. I tried to use GDB debugger, but I am unable to locate where this problem occurs.

I've received a very peculiar problem all of sudden to the Linux hosts while doing rsh to them from a remote site and them opening a file it returns the file opened very limited on the terminal saying that the stty size shows 0 0. Secondly, this is not limited to a particular hosts its for all the users whosoever doing rsh to the remote machine over the WAN. Another weird scene is that , if we do rsh from some near WAN location the it works fine while others not. $ stty size 0 0 Client connections & OS: ------------------------ Both Source and Destination are using same OS. Below is Just an example while opening a file it only opens up to half window. I'm just suspecting if a N/W change like at the switch/routing level for network may impact this. Linux releases : ---------------- RedHat: all versions CentOS: all versions

I've around 40k lines of file with paths which I need to take size from remote site (using rsh & du -scL command). I tried with while read line but due to remote connection, it exits after 100+ lines. So I tried to copy all the lines in to a file with du -scL and input the file in to one rsh but again it's crashed saying 'command too long'. I need to do a script which calc the size of all these paths from remote site using rsh and du. #!bin/bash for line in cat $destbang1 do rsh vnc. du -sL $line | awk '{print $1}' >> /tmp/size1.txt done total=gawk '{ sum += $1 }; END { print sum}' /tmp/size1.txt echo $total

I have two hosts with Red Hat 7.4 , HostA and HostB. The rsh-server and rsh packages was installed in both. At both hosts, the rsh deamon was activated, the commands rsh,rlogin,rexec was added to /etc/securetty, at /etc/hosts.equiv the HostA and HostB was added. From **hostA**, with root, when I run rsh hostb, connects successfully without ask password. From **hostA**, with any other user, give the error : rcmd: socket: Permission denied. From **hostB**, with root, when I run rsh hosta, connects successfully without ask password. From **hostB**, with any other user, connects successfully without ask password. I already try add the set bit : chmod +a $(which rsh) , but have no effect. The SELINUX is disabled on both hosts. The firewall is disabled on both hosts.

I have two servers with RHEL 6.6 installed. I'm trying to do an RSH connection between these two. Following are the errors which I'm getting: connect to address 172.21.70.95 port 544: Connection refused trying normal rsh (/usr/bin/rsh) poll: protocol failure in circuit setup One server was able to do the RSH connection to a third server when it was on another network. But on this network, it is not able to do the same. Same configurations are done here on this network and on both the servers but still, I'm facing this issue.

I am trying to use RSH commands using for example: rsh -l root 10.0.2.5 "ls" When I run this command I get getnameinfo: Temporary failure in name resolution but I get a shell by just running rsh -l root 10.0.2.5 How do I fix this issue? (I have to use RSH, I am exploiting this service suggesting a switch would defy the point)

**Please don't even think of suggesting to use ssh. I use ssh and I know how to use it. But sometimes I just want to use rsh! There are good reasons to do so, if you know what you are doing!** actually I never really understood pam but I assume that pam is my problem on this amazon linux system I try to configure. In our days password driven logins to machines is nothing you really want, and communicating with remote machines in plain-text is not usefull either. So anytime when I talk to a AWS Instance my communication flows through a VPN Tunnel and is encrypted by that tunnel. So I'm trying to use rsh / rlogin for my AWS machines. I did that before in some gentoo linux distributions and it was easy enough to setup rsh to communicate through openvpn tunneled private IP addresses. The whole r* stuff works fine and the .rhosts mechanism lets my user through and starts the login process to continue with the session. The next thing I see then is just EXIT (in my remote console and in the syslog). In the strace it looks as if login immediately hangs up. I assume that is a PAM feature, but I cannot debug pam, nor can I read these interleaved pam configuration files. Using /etc/pam_debug does not work. I never got a pam_echo, I can't see any debug output from pam, though the syslogger has debug messages enabled and I can see these debug messages from other services. But not from pam. I used the strace method, so I can see that the r* realm has already been left and the rlogind already started login for my user, to be logged in, so you don't need to answer what I might need to configure to get rsh / rlogin running. They just do. If I could get a session for that rlogin from the login process, I think I would be ready to use rsh / rlogin. Here is the login configuration file from /etc/pam.d: #%PAM-1.0 auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so auth substack system-auth auth include postlogin account required pam_nologin.so account include system-auth password include system-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session required pam_loginuid.so session optional pam_console.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so open session required pam_namespace.so session optional pam_keyinit.so force revoke session include system-auth session include postlogin -session optional pam_ck_connector.so The working gentoo login configuration mainly comes from "system-login": auth required pam_tally2.so onerr=succeed auth required pam_shells.so auth required pam_nologin.so auth include system-auth account required pam_access.so account required pam_nologin.so account include system-auth account required pam_tally2.so onerr=succeed password include system-auth session optional pam_loginuid.so session required pam_env.so session optional pam_lastlog.so silent session include system-auth session optional pam_motd.so motd=/etc/motd session optional pam_mail.so Thanks for any hints!

I am trying to figure out how I could manage more easily my servers. I'd like to know if I can make my scripts available to all the servers without copying them to the servers. They are located in my computer (client side), bash-3.2$ ls -l my_local_script -rwxr--r-- 1 mario staff 554 Jan 9 13:35 my_local_script I always login remotely with my terminal using SSH bash-3.2$ ssh root@192.168.56.140 root@192.168.56.140's password: [root@prodsrvr00 ~]# Once I am logged into the server, I'd like to know if there is any way to execute the script like it was locally available without copying it to the server. [root@prodsrvr00 ~]# my_local_script Since it's a NAT network, I cannot SSH back to my computer (the client).

Environment: CentOS 6.6 When running this simple test (from myclient): while true; do rsh myserver "echo OK"; done After ~500 iterations, the server runs out of ports. netstat -anp on the server shows: tcp 0 0 myserver:1008 myclient:922 TIME_WAIT - tcp 0 0 myserver:975 myclient:922 TIME_WAIT - tcp 0 0 myserver:998 myclient:922 TIME_WAIT - tcp 0 0 myserver:991 myclient:922 TIME_WAIT - tcp 0 0 myserver:1007 myclient:922 TIME_WAIT - tcp 0 0 myserver:1000 myclient:922 TIME_WAIT - tcp 0 0 myserver:990 myclient:922 TIME_WAIT - tcp 0 0 myserver:979 myclient:922 TIME_WAIT - tcp 0 0 myserver:1003 myclient:922 TIME_WAIT - tcp 0 0 myserver:988 myclient:922 TIME_WAIT - tcp 0 0 myserver:984 myclient:922 TIME_WAIT - tcp 0 0 myserver:1002 myclient:922 TIME_WAIT - tcp 0 0 myserver:997 myclient:922 TIME_WAIT - tcp 0 0 myserver:1019 myclient:922 TIME_WAIT - tcp 0 0 myserver:995 myclient:922 TIME_WAIT - tcp 0 0 myserver:993 myclient:922 TIME_WAIT - tcp 0 0 myserver:1004 myclient:922 TIME_WAIT - tcp 0 0 myserver:1017 myclient:922 TIME_WAIT - tcp 0 0 myserver:1013 myclient:922 TIME_WAIT - tcp 0 0 myserver:1011 myclient:922 TIME_WAIT - tcp 0 0 myserver:1009 myclient:922 TIME_WAIT - tcp 0 0 myserver:994 myclient:922 TIME_WAIT - tcp 0 0 myserver:987 myclient:922 TIME_WAIT - tcp 0 0 myserver:986 myclient:922 TIME_WAIT - tcp 0 0 myserver:1012 myclient:922 TIME_WAIT - tcp 0 0 myserver:1010 myclient:922 TIME_WAIT - tcp 0 0 myserver:1014 myclient:922 TIME_WAIT - tcp 0 0 myserver:996 myclient:922 TIME_WAIT - 922 is the RSH stderr port (from monitoring with wireshark). After approximatively one minute, the sockets are closed on the server and new connections can be made. So it seems the client or the server fails to properly close these sockets, and they just timeout. Is this a bug in rsh ? Any idea to work around this ? I can see BSD's rsh has a --no-stderr option, but Linux does not seem to.

I've made a batch file on a Windows machine, with the following command: rsh hdvg-1 -l root lspci The hdvg-1 is the name of the Linux machine on the network. But what I get in result is: command not found. Can someone tell me what i am doing wrong? Perhaps also help me to use the following command in order to filter the lspci result: lspci | grep 'certain string

I am working with rsh. I want to check the whole process from beginning to end. For that I used strace. Os name is CentOS. I am working on single machine, server and client are on same machine. My command is , rsh localhost ulimit -n To take a trace, I used strace rsh localhost ulimit -n. I read all the files that is open during executing above command. But I want to trace how the rsh server sets the limit of ulimit -n, because all commands in rsh run by rsh daemon. The system call I am looking for is, setrlimit, but it didn't show this system call by using strace rsh localhost ulimit -n. For that I have to trace rsh server , i.e, rsh daemon. But I don't know, how I perform this task. Please tell me the command and their explanations also. **I know rsh is not used in current scenario, but my project is using that, so please don't tell , rsh is not good. I know all these stuffs.** **Edit No. 1** $ sudo lsof -i :514 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME syslogd 2210 root 9u IPv4 6259 UDP *:syslog xinetd 2658 root 8u IPv4 8745 TCP *:shell (LISTEN) and, /etc/xinetd.d, does not contain rshd, it contains rsh, rexec, rlogin, rsync, etc. **Edit no 2** [related to comment by Chris Down] rsh localhost strace -o log_new bash -c 'ulimit -n' It gives different answer that it gives when I run strace rsh localhost ulimit -n execve("/bin/bash", ["bash", "-c", "ulimit", "-n"], [/* 15 vars */]) = 0 brk(0) = 0x13e86000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2af7bbab2000 uname({sys="Linux", node="jhamb.XXX.XXX", ...}) = 0 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=57641, ...}) = 0 mmap(NULL, 57641, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2af7bbab3000 close(3) = 0 open("/lib64/libtermcap.so.2", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@\17\300T4\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=15584, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2af7bbac2000 mmap(0x3454c00000, 2108688, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x3454c00000 mprotect(0x3454c03000, 2093056, PROT_NONE) = 0 mmap(0x3454e02000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x3454e02000 close(3) = 0 open("/lib64/libdl.so.2", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\16@T4\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=23360, ...}) = 0 mmap(0x3454400000, 2109696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x3454400000 mprotect(0x3454402000, 2097152, PROT_NONE) = 0 mmap(0x3454602000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x3454602000 close(3) = 0 open("/lib64/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\332\1T4\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1726320, ...}) = 0 mmap(0x3454000000, 3506520, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x3454000000 mprotect(0x345414f000, 2097152, PROT_NONE) = 0 mmap(0x345434f000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14f000) = 0x345434f000 mmap(0x3454354000, 16728, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3454354000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2af7bbac3000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2af7bbac4000 arch_prctl(ARCH_SET_FS, 0x2af7bbac3dd0) = 0 mprotect(0x3454602000, 4096, PROT_READ) = 0 mprotect(0x345434f000, 16384, PROT_READ) = 0 mprotect(0x3453e1c000, 4096, PROT_READ) = 0 munmap(0x2af7bbab3000, 57641) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 open("/dev/tty", O_RDWR|O_NONBLOCK) = -1 ENXIO (No such device or address) ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fffb504cb00) = -1 EINVAL (Invalid argument) brk(0) = 0x13e86000 brk(0x13ea7000) = 0x13ea7000 getuid() = 500 getgid() = 500 geteuid() = 500 getegid() = 500 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 open("/proc/meminfo", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2af7bbab3000 read(3, "MemTotal: 3920228 kB\nMemFre"..., 4096) = 777 close(3) = 0 munmap(0x2af7bbab3000, 4096) = 0 rt_sigaction(SIGCHLD, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGCHLD, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, 8) = 0 rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, 8) = 0 rt_sigaction(SIGQUIT, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGQUIT, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigaction(SIGQUIT, {0x1, [], SA_RESTORER, 0x3454030330}, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, 8) = 0 uname({sys="Linux", node="jhamb.XXX.XXX", ...}) = 0 stat("/home/service", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat(".", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 getpid() = 30873 getppid() = 30829 stat(".", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/service/bin/bash", 0x7fffb504cab0) = -1 ENOENT (No such file or directory) stat("/usr/local/sbin/bash", 0x7fffb504cab0) = -1 ENOENT (No such file or directory) stat("/usr/local/bin/bash", 0x7fffb504cab0) = -1 ENOENT (No such file or directory) stat("/usr/sbin/bash", 0x7fffb504cab0) = -1 ENOENT (No such file or directory) stat("/sbin/bash", 0x7fffb504cab0) = -1 ENOENT (No such file or directory) stat("/usr/kerberos/bin/bash", 0x7fffb504cab0) = -1 ENOENT (No such file or directory) stat("/usr/bin/bash", 0x7fffb504cab0) = -1 ENOENT (No such file or directory) stat("/bin/bash", {st_mode=S_IFREG|0755, st_size=801512, ...}) = 0 access("/bin/bash", X_OK) = 0 access("/bin/bash", R_OK) = 0 stat("/bin/bash", {st_mode=S_IFREG|0755, st_size=801512, ...}) = 0 access("/bin/bash", X_OK) = 0 access("/bin/bash", R_OK) = 0 getpgrp() = 30829 rt_sigaction(SIGCHLD, {0x436080, [], SA_RESTORER, 0x3454030330}, {SIG_DFL, [], SA_RESTORER, 0x3454030330}, 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 getpeername(0, {sa_family=AF_INET, sin_port=htons(61000), sin_addr=inet_addr("127.0.0.1")}, ) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 getrlimit(RLIMIT_FSIZE, {rlim_cur=RLIM_INFINITY, rlim_max=RLIM_INFINITY}) = 0 fstat(1, {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2af7bbab3000 write(1, "unlimited\n", 10) = 10 exit_group(0) = ? **Edit No.3** # grep -e ulimit -e setrlimit rsh.strace. rsh.strace.31472:14:22:42.966361 setrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=1024}) = 0 rsh.strace.31474:14:22:43.085822 execve("/bin/bash", ["bash", "-c", "ulimit -n"], [/* 4 vars */]) = 0 rsh.strace.31474:14:22:43.546754 setrlimit(RLIMIT_CORE, {rlim_cur=RLIM_INFINITY, rlim_max=RLIM_INFINITY}) = 0 **Edit No. 4: /etc/security/limits.conf with comments removed** * soft core unlimited * hard core unlimited @service hard nofile 13000 @service soft nofile 13000 * soft nofile 12000 * hard nofile 12000

Consider a data transfer over a pipeline network in legacy systems with remote shell (RSH), like: rsh host -l user tar -cf - /home/dir \| compress | uncompress | tar -xvf - and this one in 'modern' systems: ssh user@host tar -cf - /home/dir \| gzip | ungzip | tar -xvf - **PERFORMANCE ISSUES:** I experienced a very bad performance running a transfer among AIX 4.3 to AIX 5.3 using RSH. Even having idle cards (10/100) connecting them through an idle switch, I got a performance about 350Kbps transferring 5.4GB. When running this transferring among AIX 5.3 and Linux, but now using SSH and gzip, the performance is way better, but never reachs the network capacity (In a 1 Gigabit LAN I got an average of about 400Mbps). Are there ways to optimize the network pipeline performance maybe customizing pipe buffers or network block/buffers, or what ?