point-to-point network with unknown peer ip address

[Peter Jeremy]

On 2013-Feb-20 02:56:55 -0800, "M. V." <bored_to_death85 at yahoo.com> wrote:
>I have 2 FreeBSD8.2 systems. I have a point-to-point interface
>(myif0) on each side connected together, but on each side I don't
>know IP address of the other side. to make the connection work, On
>each side I set IP address (2.2.2.32/24 and 2.2.2.33/24) and added a
>route which sends all traffic to the network to interface:
>
>#route add 2.2.2.0/24 -interface myif0
>
>#ifconfig myif0
>myif0: flags=89d1<UP,POINTOPOINT,RUNNING,NOARP,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500

I'm not certain what you are trying to achieve but point-to-point links
would normally be /32, not /24.

>now, from one side if I ping the other side (say 2.2.2.33/24)
>everything seems ok. but if I ping any other IP in the network (say
>2.2.2.100/24) the other endpoint sends back packet + an ICMP REDIRECT
>packet.

2.2.2.100 is not a valid address in the network you have described.
Where did you expect you expect the packet to be sent?

>my sysctl output:
>...
>
>net.inet.ip.redirect: 1
>net.inet.icmp.drop_redirect: 0
>...

You don't say what you are trying to achieve but my crystal ball says that
you want net.inet.ip.forwarding=1 on the remote system.

-- 
Peter Jeremy
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