On Tue, 2003-10-21 at 03:39, Mark Devin wrote: > I am having some trouble getting routing to work properly on a box with > three network connections. One, eth0, is connected to a router and is > the default gateway. Another, ppp0 (eth1 - ADSL) is connected to a > private network on the 192.168.17.0/24 address range. The third is a > standard LAN (eth2) on 192.168.2.0/24. > > From the debian box, I can ping other machines connected via the ADSL > modem via ppp0. I can also ping machines on the internet via eth0 from > this box. In addition, any machine on the Office LAN can connect to > machines on the internet. > > However, if a machine on the office LAN tries to connect to a machine on > the 192.168.17.0/24 network, the packets disappear somewhere in the > debian box. I can see the packets coming in with tcpdump but then they > disappear. The debian box does not try to route them at all. > > Note that I have switched off all firewalling and switched ip_forwarding > on in the kernel. > > The problem is related to the ADSL - ppp0 interface. The routing rules > look OK. I can ping from the debian box via ppp0 to hosts on the > connected network. However, if I ping from the office LAN, the packets > do get to the debian box OK, but it doesn't route them out ppp0. It > just seems to drop them. There is nothing in the logs to indicate any > errors. The packets just disappear. > > The setup looks like this: > > Internet > | > x.x.47.224/27 Router x.x.47.225 > | > eth0| x.x.47.226 > | > #------------# (eth1 -ppp0 ADSL) > # Debian Box #--192.168.17.2-->x.x.16.78-->192.168.17.0/24 > #------------# > | > eth2| 192.168.2.1 > | > | > Office LAN (192.168.2.0/24) > > The routing table looks like: > # route -n > Destination Gateway Genmask Flag Met Ref Use Iface > x.x.16.78 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0 > x.x.243.224 0.0.0.0 255.255.255.224 U 0 0 0 eth0 > 192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 > 192.168.17.0 x.x.16.78 255.255.255.0 UG 0 0 0 ppp0 > 0.0.0.0 x.x.243.225 0.0.0.0 UG 0 0 0 eth0 Silly question: Are you running a routing daemon? -- greg, greg@gregfolkert.net REMEMBER ED CURRY! http://www.iwethey.org/ed_curry My elbow sockets sharpen pencils when you pass by on divine fumes of industrial combustion.
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