Date: Mon, 23 Oct 2000 11:43:46 +0100 From: Karl Pielorz <kpielorz@tdx.co.uk> To: isp@freebsd.org Subject: IP source-routing with ipfw fwd - Weird problem? Message-ID: <39F41662.61249DF9@tdx.co.uk>
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Hi All,
I'm looking for any help with this one...
I have:
---
fxp1 fxp0 ether0 serial0,
10.0.0.1 [ FreeBSD ] 192.168.0.2 ----- 192.168.0.1 [ Cisco ] 172.16.0.1
10.0.1.1 serial1,
10.0.2.1 172.16.1.1
serial2,
172.16.2.1
( I've swapped everything for Private Net IP's )
---
OK, on the FreeBSD box, a simple:
route add default 192.168.0.1
Does the trick...
However, I want to use ipfw fwd to change the exact route the traffic goes
over, depending on the IP address that it came from, on our network...
So, I do the following...
route add 172.16.1.1 192.168.0.1
ping 172.16.1.1
64 bytes from 172.16.1.1: icmp_seq=1 ttl=248 time=1.706 ms
OK, so now FreeBSD knows how to get to the 'other' serial interface on the
Cisco, i.e. 172.16.1.1, so I add my IPFW rule...
ipfw add 10 fwd 172.16.1.1 ip from 10.0.1.0/24 to any out fxp0
Again, this seems to work fine - as traffic from the 10.0.1.0/24 network, now
leaves via the Cisco's 172.16.1.1 interface (serial1).
The problem I seem to have, is that if I do:
route get 192.168.0.1
I can see the 'expire' time slowly ticking down... When it reaches zero, the
routing breaks ('Destination Host unreachable').
I then have to delete the route to 172.16.1.1, re-create it, ping it - and
pronto, everything works again...
Checking in the ARP table, shows there is an entry for 192.168.0.1, but I
can't delete it, or anything (I thought the ARP might be expiring, so I wanted
to create it as a 'permanent' entry)...
Any thoughts, info, tips, or anything would be gratefuly received...
-Karl
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