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Re: linux as multi-port (subnet) router using Ubuntu 11.10 server

From lincy <lincylin@gmail.com>
Newsgroups comp.os.linux.networking
Subject Re: linux as multi-port (subnet) router using Ubuntu 11.10 server
Date 2012-04-08 17:13 -0700
Organization http://groups.google.com
Message-ID <13689836.1943.1333930427032.JavaMail.geo-discussion-forums@pbvs10> (permalink)
References (4 earlier) <jlsdeu$2s1d$1@saria.nerim.net> <18422322.213.1333902286409.JavaMail.geo-discussion-forums@pbag4> <jlsehl$2sf8$1@saria.nerim.net> <26518308.9.1333903498341.JavaMail.geo-discussion-forums@pbtd9> <jlsjd0$2u7i$1@saria.nerim.net>

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Pascal Hambourg於 2012年4月9日星期一UTC+8上午1時54分39秒寫道：
> lincy a écrit :
> >> Did you check that /proc/sys/net/ipv4/ip_forward is actually set to 1 ?
> >> What is the output of "route -n" or "ip route" on the Linux router and
> >> on a host in each subnet ?
> >> What is the exact result (output) of the ping commands ?
> >> What is the output of iptables-save on the Linux router ?
> > 
> > 1. yes, It's 1
> > 
> > 2. 4 ports router.
> > Kernel IP routing table
> > Destination    Gateway        Genmask        Flags   Metric   Ref   Use  Iface
> > 0.0.0.0        192.168.1.254  0.0.0.0        UG      100      0     0    eth0
> > 192.168.2.0    *              255.255.255.0  U       0        0     0    eth1
> > 192.168.3.0    *              255.255.255.0  U       0        0     0    eth2
> > 192.168.4.0    *              255.255.255.0  U       0        0     0    eth3
> > 192.168.1.0    *              255.255.255.0  U       0        0     0    eth0
> > 
> > client machine. (windows)
> > IP address : 192.168.2.181
> > netmask : 255.255.255.0
> > gateway : 192.168.2.1
> 
> What about the host on the other subnet, 192.168.3.51 ?

IP address : 192.168.3.51
netmask : 255.255.255.0
gateway : 192.168.3.1

> 
> > 3.
> > ping 192.168.3.51
> > Timeout...
> > Timeout...
> 
> I would run tcpdump on the router to see what is going on...

I have using tcpdump to listen eth1 (192.168.2.0) and eth2 (192.168.3.0),
I have saw the 192.168.3.51 have echo icmp request. But this package only reach 192.168.3.1, not going to 192.168.2.1, so, 192.168.2.181 report time out.

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Thread

linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-08 05:50 -0700
  Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2012-04-08 17:16 +0300
    Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-08 08:26 -0700
      Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-08 08:47 -0700
        Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-04-08 18:13 +0200
          Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-08 09:24 -0700
            Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-04-08 18:31 +0200
              Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-08 09:44 -0700
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-04-08 19:54 +0200
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-08 17:13 -0700
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-04-09 10:45 +0200
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-09 06:40 -0700
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-04-09 21:01 +0200
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-09 12:56 -0700
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-04-09 23:33 +0200
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2012-04-10 08:55 +0300
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-09 23:40 -0700
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2012-04-10 14:39 +0300
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-10 08:22 -0700
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2012-04-08 21:13 +0300
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-04-08 20:48 +0200
                Re: linux as multi-port (subnet) router using Ubuntu 11.10 server lincy <lincylin@gmail.com> - 2012-04-08 17:25 -0700

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