Route already in table (FreeBSD 7.X)

T

TylerJ

I have a question regarding routes in FreeBSD 7.X I have a static route that I've added with:

route add -host 255.255.255.255 -interface lagg0

This works correctly, and netstat -r shows:

Code: 
Internet:
Destination        Gateway            Flags    Refs      Use  Netif Expire
default           some-router UGS         0    24050  lagg0
< some other entries >
255.255.255.255 ff:ff:ff:ff:ff:ff UHLSb 1 0 lagg0

If I change it to use a different interface, I can do that as well via:

route add -host 255.255.255.255 -interface bge0

Code: 
Internet:
Destination        Gateway            Flags    Refs      Use  Netif Expire
default            some-router UGS         0    24050  lagg0
< some other entries >
255.255.255.255    00:60:dd:45:8a:ec  UHSb        0        0   bge0

However, if I try and add BACK the original interface, it complains:

route add -host 255.255.255.255 -interface lagg0

Code: 
route: writing to routing socket: File exists
add host 255.255.255.255: gateway lagg0: route already in table

I wanted to know if this is expected behavior. I did some debugging in with sys/net/route.c and saw that it's sending back an EEXIST code, but I'm unsure why it would choose to do that. I'm assuming its because of a duplicate dst/netmask/gw pairs, but this doesn't seem right in that context. Can anyone confirm this is expected behavior? I looked at FreeBSD-CURRENT and it looks like there's a slightly different implementation. Wasn't sure if this had been a known bug or not (searched for it, but wasn't turning up results).
 
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