Re: [LARTC] simple router

[Jing Shen <jshen@cad.zju.edu.cn>]

What's the routing table  in host and server  looks like ?
if there is only one connection on both of them , the routing table in
host only need one entry as :  0.0.0.0/0 -> xx.yy.88.100
and server need : 0.0.0.0/0 ->xx.zz.110.145

You don't need to add host route explicitly in the router becasue
the subnet on network interface is included in routing table by default.

Another indication is  "have you enabled iptable on router to block connection
between
different subnet?"

James Shen


> Hello,
>
> I am attempting to construct a (simple?) router based
> on Linux 2.4 with iproute2.
>
> I have 3 ethernet cards on the router, with eth0
> connected to a host,eth1 connected to a server and
> eth2 connected to another computer.
>
>                       xx.yy.88.101
>                        +--------+
>                        |        |
>                        |  host  |
>                        +---+----+
>                            |
>          xx.yy.zz.aa       |
>              |             |eth0 - xx.yy.88.100
>              |             |
> +---------+  |      +----------------+
> |another  | eth2    |                |
> |computer +---------+  router        |
> |         |         |                |
> +---------+         +-------+--------+
> xx.yy.zz.ab                 |
>                             | eth1 - xx.zz.110.145
>                             |
>                         +---+-----+
>                         |         |
>                         | server  |xx.zz.110.148
>                         |         |
>                         +---------+
>
> I am simply trying to get traffic through eth0 to eth1
> so it can get to the server and get back out, but so
> far I can't ping the server through the router,
> although the router itself is capable of pinging the
> server (so the link eth1 is active). And I've verified
> that eth0 is also active as the router and the host
> can ping each other.
>
> So how do I get the router to pass traffic through to
> the server?
>
> I've tried
>     # ip route add to unicast xx.zz.110.148 dev eth1
>     RTNETLINK answers: File exists
>
> and yet the host still can't ping the server.
>
> And I've tried making eth0 "promiscuous"
>         # ifconfig eth0 promisc
> but that doesn't help either.
>
> Anyone know the magic incantation that I need?
>
> --
> Jeremiah
>
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