Prevent eth0 from adding default route

I am looking for a way to prevent eth0 interface from adding a default route to my main routing table on my Linux machine. I have a Debian distribution (Jessie - 8.0) and was looking at the post-up directive in /etc/network/interfaces. My current configuration looks as follows: **ifconfig** eth0 Link encap:Ethernet HWaddr b8:27:eb:4b:f4:9e inet addr:172.16.2.82 Bcast:172.16.3.255 Mask:255.255.252.0 inet6 addr: fe80::ba27:ebff:fe4b:f49e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2311 errors:0 dropped:0 overruns:0 frame:0 TX packets:203 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:187402 (183.0 KiB) TX bytes:22251 (21.7 KiB) ppp0 Link encap:Point-to-Point Protocol inet addr:10.178.142.185 P-t-P:192.200.1.21 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:36 errors:0 dropped:0 overruns:0 frame:0 TX packets:56 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:2918 (2.8 KiB) TX bytes:3426 (3.3 KiB) **/etc/network/interfaces** auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp post-up /sbin/route del default dev eth0 **ip route show table main** default dev ppp0 scope link default via 172.16.0.40 dev eth0 metric 202 10.64.64.65 dev ppp1 proto kernel scope link src 10.181.104.9 169.254.0.0/16 dev wlan0 proto kernel scope link src 169.254.23.201 metric 303 169.254.0.0/16 dev wwan0 proto kernel scope link src 169.254.62.145 metric 305 172.16.0.0/22 dev eth0 proto kernel scope link src 172.16.2.160 metric 202 192.168.42.0/24 dev wlan0 proto kernel scope link src 192.168.42.1 192.200.1.21 dev ppp0 proto kernel scope link src 10.179.96.79 Sadly, this approach only works if the interface is brought up using ifup eth0, and not when the cable is physically connected and ip assigned. Even still, this approach doesn't delete the default entry and ifup gives the following error: Internet Systems Consortium DHCP Client 4.3.1 Copyright 2004-2014 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Listening on LPF/eth0/b8:27:eb:4b:f4:9e Sending on LPF/eth0/b8:27:eb:4b:f4:9e Sending on Socket/fallback DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6 DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11 DHCPREQUEST on eth0 to 255.255.255.255 port 67 DHCPOFFER from 172.16.0.8 DHCPACK from 172.16.0.8 eminstBootdpxeboot.com option - discarded eminstBootdpxeboot.com option - discarded bound to 172.16.2.82 -- renewal in 12663 seconds. SIOCDELRT: No such process Failed to bring up eth0. I would like to know a proper way to ensure that the default route is not added through eth0 and **not** have to bring up eth0 manually using ifup (to leverage post-up) but rather use the one that is already initialized on boot.