From owner-freebsd-net  Wed Jan 31  9:21: 2 2001
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From: parminder.mudhar@bt.com
To: freebsd-net@FreeBSD.org
Subject: Routes and tunnels
Date: Wed, 31 Jan 2001 17:01:51 -0000
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Hi

I don't know if this is intentional or a bug, but if ifconfig is used to
configure a point to point device, such as 'tun' or the newer 'gif' devices,
then the kernel insists on installing a route where the destination is the
end point of the tunnel, the gateway is the source of the tunnel and the
interface is the device itself. I have checked this in version 3.2+KAME,
what I a using, and also on version 4.1. The effect of the above is that the
packet that uses the tunnel will never appear on the wire.

Here is an output

the_swamp# ifconfig gif0 132.146.115.164 132.145.113.1
the_swamp# netstat -rnf inet
Routing tables

Internet:
Destination        Gateway            Flags      Netif Expire
default            132.146.115.1      UGSc        1        0     fxp1
127.0.0.1          127.0.0.1          UH          0        4      lo0
132.145.113.1      132.146.115.164    UH          0        0     gif0
132.146.115/24     link#2             UC          0        0     fxp1 =>
132.146.115.1      0:30:19:9a:e4:71   UHLW        2        0     fxp1    460

I am also interested in using gated with point to point tunnels, but gated
also insists on doing the above for point to point links.

I thank you in advance for any advice you may have.

Parminder Mudhar
__________________________
parminder.mudhar@bt.com



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