PTP host address loops back through destination?

[Roy Marples]

Hi List

I have

pppoe0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1492
inet 1.2.3.4 -> 5.6.7.8 netmask 0xffffffff

traceroute to 1.2.3.4
1 5.6.7.8
2 1.2.3.4

Why does this happen? Can I stop this behaviour as traffic for the host
shouldn't leave the host?

Thanks

Roy

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[Manuel Bouyer]

Post by Roy Marples
Hi List
I have
pppoe0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1492
inet 1.2.3.4 -> 5.6.7.8 netmask 0xffffffff
traceroute to 1.2.3.4
1 5.6.7.8
2 1.2.3.4
Why does this happen?

I guess, it's because the route for this address is through the pppoe0
interface (try: route get -host 1.2.3.4), and as it's a p2p interface
it sends all packets to the remote end without looking at the local
address.

Post by Roy Marples
Can I stop this behaviour as traffic for the host
shouldn't leave the host?

I guess you can manually set a route to lo0 for 1.2.3.4

[Roy Marples]

Post by Manuel Bouyer

Post by Roy Marples
I have
pppoe0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1492
inet 1.2.3.4 -> 5.6.7.8 netmask 0xffffffff
traceroute to 1.2.3.4
1 5.6.7.8
2 1.2.3.4
Why does this happen?

I guess, it's because the route for this address is through the pppoe0
interface (try: route get -host 1.2.3.4), and as it's a p2p interface
it sends all packets to the remote end without looking at the local
address.

Can I assume that this is a bug and as such file a PR, or behaviour by design?

Post by Manuel Bouyer

Post by Roy Marples
Can I stop this behaviour as traffic for the host
shouldn't leave the host?

I guess you can manually set a route to lo0 for 1.2.3.4

*facepalm*

This works fine, thanks! Nice easy solution.

I added this to /etc/ip-up
/sbin/route add -host $4 127.0.0.1
and remove it in /etc/ip-down the same way.
Should we add this http://www.netbsd.org/docs/network/pppoe/ ?

Thanks

Roy

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