Take the 2-minute tour ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

I have two Internet channel and Gateway on freebsd. When I switch channel with the command route change default chan2, the command netstat -nr shows changed default route. But traceroute shows that the packets go through the old route chan1.

Example:

$netstat -nr 
Routing tables Internet: Destination Gateway  Flags    Refs   Use  Netif Expire
                         default     xxx.xxx.183.54 US 0 8432    em3

$sudo route change default xxx.xxx.144.125 
change net default: gateway> xxx.xxx.144.125

$netstat -nr
Routing tables Internet: Destination Gateway Flags Refs Use  Netif Expire
                         default     xxx.xxx.144.125   US  2  16450  em3

BUT

$ traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 52 byte packets
 1  84.47.183.53 (xxx.xxx.183.53)  0.527 ms  0.415 ms  0.483ms

All works if I run the following combination:

$sudo route del default

$sleep 10

$sudo route add default xxx.xxx.144.125

share|improve this question
    
What version are you running (uname -a should show)? –  Chris S Jul 9 '13 at 14:45
    
FreeBSD 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Fri Apr 15 12:45:40 MSD 2011 root@grs.ru:/usr/src/sys/amd64/compile/IXI_8_2_PF_x64 amd64 –  Taron Jul 9 '13 at 16:38
    
The gateway in your first routing table and the first hop in your traceroute aren't the same (.53 vs .54) - did you copy and paste or re-type this? Can you also post the full output of netstat -rnf inet? –  James O'Gorman Jul 10 '13 at 7:52
    
traceroute running from my GW (.54), .53 is IP first provider`s device. –  Taron Jul 10 '13 at 10:33
2  
Clear the ARP cache arp -d -a and/or routing tables route flush before adding the new default route. Possibly the kernel/user space is consulting stale data. –  inetplumber Sep 8 '13 at 20:11

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.