Re: Using FreeBSD as a router

On 22.08.2007 12:30:54 +0100, Tom Judge wrote:
Steffen Schumacher wrote:
Hi!
This may b the wrong list, but you might know the right one..
I'm using the port quagge (zebra spin-off) in order to run bgp
off of two freebsd boxes, serving as routers.
They receive a default candidate from bgp: a/b.
The aim is to configure a static default with a next-hop of a/b.
This way the isp doesn't have to announce a 0/0, and I will still
have a default pointing the right way.
(I'm getting the a/b in from two separate lines for redundancy).
My problem is that I can't make the default work.
I use 'route default a/b' which actually shows up in 'netstat -rnf inet'
but it still doesn't work.
I've enclosed a lot of debug output.
Can anyone point me in the right direction?
Debug output:
g3# route add default 195.249.0.0
add net default: gateway 195.249.0.0

Firstly this address is not a valid host address it is a network address.
as shown by the routing entry below. Secondly your default gateway must be
on your local network segment to work however 195.249.0/16 is behind the
router 131.164.191.1.

195.249.0/16 131.164.191.1 UG1 1 12 vlan7

Perhaps your default gateway should be 131.164.191.1 ??


Yes - ultimately that should be my gateway, but I want FreeBSD to realize
this by looking at the 195.249.0/16 route.
The thing is that 195.249.0/16 will also be seen from 131.164.191.2 but with
a lower localpref, making 131.164.191.1 the best choice. This way if .1 dies,
195.249.0/16 should be routed towards .2, and ultimately my default should go
at .2 also.
This is the goal - to make the default move to .2 if .1 is dead, and back when
1. comes back up again.

I don't think it matters if I use 195.249.0.0 or 195.249.1.1, since the router
receiving the packets will do their own routing lookup. Whats important is only
getting the next-hop mac/if for the default route, and that should be available
from the 195.249.0/16 route.

/Steffen
Tom

g3# netstat -rnf inet
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 195.249.0.0 UGS 0 0 vlan7
127.0.0.1 127.0.0.1 UH 0 725 lo0
131.164.191/29 link#10 UC 0 0 vlan7
131.164.191.1 00:12:1e:f0:a0:fe UHLW 2 33782 vlan7 260
131.164.191.2 00:0f:34:62:27:38 UHLW 1 5927 vlan7 1127
131.164.191.3 00:0e:0c:b2:c6:55 UHLW 1 35 lo0
131.164.191.9 192.168.0.2 UGH1 0 981 vlan1
131.164.191.10 131.164.191.10 UH 0 4 lo0
131.164.191.16/29 192.168.0.2 UG1 0 270 vlan1
131.164.191.24 ff:ff:ff:ff:ff:ff UHLWb 1 50 vlan5 =>
131.164.191.24/29 link#8 UC 0 0 vlan5
131.164.191.27 00:0e:0c:b2:c6:55 UHLW 1 4 lo0
131.164.191.31 ff:ff:ff:ff:ff:ff UHLWb 1 39 vlan5
192.168.0 link#4 UC 0 0 vlan1
192.168.0.2 00:0e:0c:bd:27:38 UHLW 3 12241 vlan1 1113
192.168.10 link#5 UC 0 0 vlan2
192.168.11 link#4 UC 0 0 vlan1
192.168.20 link#6 UC 0 0 vlan3
192.168.20.2 00:0e:0c:bd:27:38 UHLW 1 508 vlan3 31
192.168.21 link#7 UC 0 0 vlan4
195.249.0/16 131.164.191.1 UG1 1 12 vlan7
and some route lookups:
g3# route -vn get 0
u: inet 0.0.0.0; u: link ; RTM_GET: Report Metrics: len 168, pid: 0, seq
1, errno 0, flags:<UP,GATEWAY,STATIC>
locks: inits: sockaddrs: <DST,NETMASK,IFP>
default default route to: default
destination: default
mask: default
gateway: 195.249.0.0
interface: vlan7
flags: <UP,GATEWAY,DONE,STATIC>
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu
expire
0 0 0 0 0 0 9504
0 locks: inits: sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA>
default 195.249.0.0 default vlan7:0.e.c.b2.c6.55 131.164.191.3
g3# route -vn get 195.249.0.0
u: inet 195.249.0.0; u: link ; RTM_GET: Report Metrics: len 172, pid: 0,
seq 1, errno 0, flags:<UP,GATEWAY,STATIC>
locks: inits: sockaddrs: <DST,NETMASK,IFP>
195.249.0.0 (0) 0 ffff route to: 195.249.0.0
destination: 195.249.0.0
mask: 255.255.0.0
gateway: 131.164.191.1
interface: vlan7
flags: <UP,GATEWAY,DONE,PROTO1>
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu
expire
0 0 0 0 0 0 9504
0 locks: inits: sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA>
195.249.0.0 131.164.191.1 255.255.0.0 vlan7:0.e.c.b2.c6.55 131.164.191.3
g3# route -vn get 131.164.191.1
u: inet 131.164.191.1; u: link ; RTM_GET: Report Metrics: len 164, pid: 0,
seq 1, errno 0, flags:<UP,GATEWAY,HOST,STATIC>
locks: inits: sockaddrs: <DST,IFP>
131.164.191.1 route to: 131.164.191.1
destination: 131.164.191.1
interface: vlan7
flags: <UP,HOST,DONE,LLINFO,WASCLONED>
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu
expire
0 0 0 0 0 0 9504
84 locks: inits: sockaddrs: <DST,GATEWAY,IFP,IFA>
131.164.191.1 0.12.1e.f0.a0.fe vlan7:0.e.c.b2.c6.55 131.164.191.3
_______________________________________________
freebsd-isp@xxxxxxxxxxx mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-isp
To unsubscribe, send any mail to "freebsd-isp-unsubscribe@xxxxxxxxxxx"

_______________________________________________
freebsd-isp@xxxxxxxxxxx mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-isp
To unsubscribe, send any mail to "freebsd-isp-unsubscribe@xxxxxxxxxxx"
_______________________________________________
freebsd-isp@xxxxxxxxxxx mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-isp
To unsubscribe, send any mail to "freebsd-isp-unsubscribe@xxxxxxxxxxx"

Relevant Pages