[CentOS] Routing issue between 2 LANs
José María Terry Jiménez
jtj at tssystems.net
Mon Dec 20 21:02:20 UTC 2010
Andrej Moravcik escribió:
> Hello Jose,
>
> from the picture you provided the situation looks pretty simple.
>
> - you have enabled IP forwarding on router, I recommend you to put it
> into /etc/sysctl.conf for persistence.
>
> - you have configured firewall rules on router to allow forwarding
> traffic from left to right subnet. You can also try to set up ACCEPT
> policy just for testing.
>
>
> - the default gateway for left subnet is 192.168.1.1 (you mentioned
> router for Internet access). Correct me if I'm wrong.
>
> - the default gateway for right subnet I assume is 192.168.236.74. You
> don't have to do anything with routing here. Every host in right subnet
> knows where to send replies.
>
>
> - the problem seems to be missing routing information in left subnet.
> Hosts don't know anything about the right subnet and thus send requests
> to the default gateway 192.168.1.1.
>
> - modifying routing table on every host in left subnet can be solution
> in case, if there is only a few hosts which need to access right subnet
>
> - if you need to have fully accessible subnets, put the static route to
> default gateway 192.168.1.1 to redirect requests to proper gateway. If
> it is Linux gateway, try something like this
>
> [root at default-gw]# ip route add 192.168.236.0/24 via 192.168.236.74
>
>
> Regards
>
> Andrej
>
>
>
> Jose Maria Terry Jimenez wrote:
>
>
>> I have a CentOS 5.5 machine with 2 nics each one configured to work in
>> one of the nets. The CentOS also uses a router for Internet access that
>> is 192.168.1.1.
>>
>> 192.168.1.0/24 >-----192.168.1.100--[CentOS Machine]--192.168.236.74
>> --------< 192.168.236.0/24
>>
>
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>
Thank you very much, Andrej.
Today i couldn't test this, but default gateway for right subnet is
192.168.236.21 and i can't change anything in that router and many
machines of that network, i only admin a few there.
Best,
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