How to get scapy to sniff on the correct interface?

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                          The sniff function in scapy in python2.7 worked fine before upgrading my linux Operating System.

    from scapy.all import *
    client_mac="c4:3d:c7:8f:03:19"
    wlan_mac="00:c0:ca:6d:ac:fa"
    sniff(iface="mon0",prn=packet_callback,filter="(ether dst "+client_mac+" and ether src "+wlan_mac+") or (ether src "+client_mac+" and ether dst "+wlan_mac+")")

After the upgrade I ran my script again in python2.7 and got these messages below from scapy

    WARNING: No route found for IPv6 destination :: (no default route?)
    tcpdump: WARNING: eth0: no IPv4 address assigned


How can I get scapy to sniff on the correct interface?

I tried adding conf.iface="mon0" above the sniff function but still no luck.

using ifconfig -a I got the following

    eth0      Link encap:Ethernet  HWaddr 00:25:22:e9:b1:28  
              UP BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
    
    lo        Link encap:Local Loopback  
              inet addr:127.0.0.1  Mask:255.0.0.0
              inet6 addr: ::1/128 Scope:Host
              UP LOOPBACK RUNNING  MTU:65536  Metric:1
              RX packets:12 errors:0 dropped:0 overruns:0 frame:0
              TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:720 (720.0 B)  TX bytes:720 (720.0 B)
    
    mon0      Link encap:UNSPEC  HWaddr 00-C0-CA-6D-AC-FA-3A-30-00-00-00-00-00-00-00-00  
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:635 errors:0 dropped:638 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:192290 (187.7 KiB)  TX bytes:0 (0.0 B)
    
    wlan0     Link encap:Ethernet  HWaddr 00:c0:ca:6d:ac:fa  
              inet addr:192.168.1.7  Bcast:192.168.1.255  Mask:255.255.255.0
              inet6 addr: fe80::2c0:caff:fe6d:acfa/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:866 errors:0 dropped:0 overruns:0 frame:0
              TX packets:811 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:385790 (376.7 KiB)  TX bytes:99505 (97.1 KiB)


                        
Asked by repzero (524 rep)
Apr 12, 2015, 11:15 PM
Last activity: Apr 13, 2015, 11:08 PM
How to get scapy to sniff on the correct interface?

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