Hi For some years I've been using a debian system as my household firewall/router. It's been sitting quietly working without any major changes, but has suddenly stopped doing so following my last aptitude update/upgrade.
Server eth0 is connected to my modem, and eth1 is connected to internal devices, using iptables to nat them and dnsmasq to provide internal naming. The first symptom after upgrade was that ifconfig showed that eth1 had no packets passing through (none transmitted, received or dropped), although eth0 and the external internet connection worked fine. I tried rebooting - no change. I tried restarting /etc/init.d/networking, which caused the symptoms to reverse: now eth1 works, internal traffic is fine, but absolutely nothing is happening on eth0. It's now stuck like this and I haven't been able to get eth0 to work again whatever I do. ifconfig shows eth0 is configured correctly (ip address, netmask, etc) and route shows the gateway is ok. dmesg doesn't show any obvious problems. But there are no packages moving through eth0 at all. Since I initially had this symptom with eth1, which now works, I guess hardware problems are ruled out. This is Debian 8.2, uname says 3.16.7-ckt11-1+deb8u5 (2015-10-09) My /etc/networks/interface goes; #------------------------------------ auto eth0 iface eth0 inet static .... auto eth1 iface eth1 inet static .... auto dsl-provider iface dsl-provider inet ppp pre-up /sbin/ifconfig eth0 up provider dsl-provider #------------------------------------ I'd made no changes at all to any configuration files before this setup stopped working, and it had previously worked unchanged for a long time. Any suggestions? Thanks Graham
