Done: Re: Help on packet forwarding
I found that it is the problem of routing on my test machine on the
192.168.1.0/24 network, fixed.
On Thursday 27 October 2011 18:08:06 you wrote:
> I'm now on a router in 3 networks, where eth0 and eth1 are in 2 LANs and
> eth2 are in a WAN. Here are the details:
>
> root@debian:/home/michael# ifconfig
> eth0 Link encap:Ethernet HWaddr 00:e0:4c:4d:77:06
> inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
> inet6 addr: fe80::2e0:4cff:fe4d:7706/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:735444 errors:0 dropped:0 overruns:0 frame:0
> TX packets:1216737 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:89416295 (85.2 MiB) TX bytes:1427122256 (1.3 GiB)
> Interrupt:20 Base address:0xcc00
>
> eth1 Link encap:Ethernet HWaddr 00:50:bf:70:fc:e4
> inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0
> inet6 addr: fe80::250:bfff:fe70:fce4/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:81044 errors:0 dropped:0 overruns:0 frame:0
> TX packets:156456 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:6883331 (6.5 MiB) TX bytes:226037112 (215.5 MiB)
> Interrupt:22 Base address:0xe800
>
> eth2 Link encap:Ethernet HWaddr 00:1e:90:90:23:7d
> inet addr:210.6.148.56 Bcast:210.6.148.127 Mask:255.255.255.128
> inet6 addr: fe80::21e:90ff:fe90:237d/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:3105649 errors:0 dropped:0 overruns:0 frame:0
> TX packets:1551451 errors:0 dropped:0 overruns:0 carrier:3
> collisions:0 txqueuelen:1000
> RX bytes:2449847469 (2.2 GiB) TX bytes:394544116 (376.2 MiB)
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> inet6 addr: ::1/128 Scope:Host
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:42718 errors:0 dropped:0 overruns:0 frame:0
> TX packets:42718 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:6858552 (6.5 MiB) TX bytes:6858552 (6.5 MiB)
>
> root@debian:/home/michael# ip route show
> default via 210.6.148.1 dev eth2
> 192.168.0.0/24 dev eth1 proto kernel scope link src 192.168.0.1
> 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.1
> 210.6.148.0/25 dev eth2 proto kernel scope link src 210.6.148.56
> root@debian:/home/michael# sysctl net.ipv4.ip_forward
> net.ipv4.ip_forward = 1
> root@debian:/home/michael# iptables --list-rules
> -P INPUT ACCEPT
> -P FORWARD ACCEPT
> -P OUTPUT ACCEPT
> root@debian:/home/michael# iptables -t nat --list-rules
> -P PREROUTING ACCEPT
> -P INPUT ACCEPT
> -P OUTPUT ACCEPT
> -P POSTROUTING ACCEPT
> -A POSTROUTING -o eth2 -j MASQUERADE
> root@debian:/home/michael# route
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
> Iface default 210006148001.ct 0.0.0.0 UG 0 0
> 0 eth2 192.168.0.0 * 255.255.255.0 U 0 0
> 0 eth1 192.168.1.0 * 255.255.255.0 U 0 0
> 0 eth0 210.6.148.0 * 255.255.255.128 U 0 0
> 0 eth2
>
> I can access all the 3 networks from the router. Moreover, I can access the
> Internet from all the LANs. However, I can't access the 192.168.1.0/24
> network from the 192.168.0.0/24 network, and vice versa. That means the
> packets are not forwarded properly between eth0 and eth1 in the router.
>
> Now I want to make the 2 LANs accessible to each other, what should I do?
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