[PLUG] Network routing

Mike Russell miker at netsailer.com
Tue Jun 25 00:49:59 UTC 2002


maybe I am wrong, but I thought the "192.168.0.0" IP block was non-routing.


At 02:54 PM 6/24/02, you wrote:
>On Mon, Jun 24, 2002 at 02:05:44PM -0700, Russell Senior wrote:
> > >>>>> "Jeff" == Jeff Blain <jelque at feather.net> writes:
> >
> > Jeff> bash-2.05a# cat /proc/sys/net/ipv4/ip_forward 1
> >
> > Was that two lines or one?  That is, was "1" the output of the "cat"?
>
>yes, it was 2 lines. I should have pasted...
>
>bash-2.05a# cat /proc/sys/net/ipv4/ip_forward
>1
>
> > Jeff> bash-2.05a# route -n Kernel IP routing table Destination Gateway
> > Jeff> Genmask Flags Metric Ref Use Iface 192.168.1.0 0.0.0.0
> > Jeff> 255.255.255.0 U 0 0 0 eth1 192.168.0.0 0.0.0.0 255.255.255.0 U 0
> > Jeff> 0 0 eth0 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
> >
> > Jeff> Running tcpdump on eth0 on machine B and trying to ping A from
> > Jeff> C...
> >
> > Try running tcpdump with a -n option and post again.
> >
>
>bash-2.05a# tcpdump -n
>tcpdump: listening on eth0
>16:44:04.722390 arp who-has 192.168.0.10 tell 192.168.0.1
>16:44:04.722438 arp reply 192.168.0.10 is-at 0:20:af:f:95:29
>16:44:05.478989 192.168.0.1.514 > 192.168.0.10.514:  udp 129
>16:44:11.520748 192.168.0.1.514 > 192.168.0.10.514:  udp 129
>16:44:15.639729 192.168.1.2 > 192.168.0.1: icmp: echo request
>16:44:15.641108 arp who-has 192.168.1.2 tell 192.168.0.1
>16:44:15.652166 192.168.0.1.514 > 192.168.0.10.514:  udp 58
>16:44:16.638050 arp who-has 192.168.1.2 tell 192.168.0.1
>16:44:16.638550 192.168.1.2 > 192.168.0.1: icmp: echo request
>16:44:17.637683 arp who-has 192.168.1.2 tell 192.168.0.1
>16:44:17.638635 192.168.1.2 > 192.168.0.1: icmp: echo request
>16:44:18.638743 192.168.1.2 > 192.168.0.1: icmp: echo request
>16:44:18.640168 arp who-has 192.168.1.2 tell 192.168.0.1
>
>When doing tcpdump -n on my firewall it shows that packets are being
>recieved, but do not route from there.
>
>10:50:24.170628 192.168.1.2 > 192.168.0.1: icmp: echo request
>10:50:24.170628 arp who-has 192.168.1.2 tell 192.168.0.1
>
>
>Jeff
>
>
>_______________________________________________
>PLUG mailing list
>PLUG at lists.pdxlinux.org
>http://lists.pdxlinux.org/mailman/listinfo/plug





More information about the PLUG mailing list