networking won't come back up until reboot after ISP outage

Jason jhelfman at
Sat Nov 7 18:07:12 UTC 2009

Have you tried restarting routing?

/etc/rc.d/routing restart

I have found the same symptoms with other outages and not performing the

I have done "/etc/rc.d/netif restart" and "/etc/rc.d/routing restart".

Wtih using these commands, I have found this to be successful in restoring
network interfaces communication, without having to reboot.

Hope this helps.

On Sat, Nov 07, 2009 at 03:05:40PM +0100, umage thus spake:
>Hello. I have had 3 network outages this week, and everytime it 
>happened, I found that my freebsd8rc1 machine/router was unable to 
>communicate over the WAN interface even after the outages ended. A 
>reboot helps, but that's not an acceptable solution.
>The symptoms are very weird: even though dhclient successfully 
>receives a dhcp lease and sets up the interface, I am unable to ping 
>the gateway. The ifconfig utility says the interface is up and 
>configured correctly; netstat -arn says routes are set up as they 
>should be; and tcpdump reports random network traffic arriving on the 
>interface (so the network itself is up and running). Taking the 
>interface down and back up doesn't help, reloading ipfw rules doesn't 
>I have some more things to test - whether tcpdump reports any 
>attempts at outgoing traffic, and whether disconnecting/reconnecting 
>the network cable will do anything. And maybe reverting ipfw rules to 
>what I've been using before. Other than this, I have no idea what 
>else to do...
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