[LARTC] Routing between two RFC1918 networks.

[LARTC] Routing between two RFC1918 networks.

[Dave Hunt]

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Hi all, 
 
I've two RFC1918 networks with a RedHat Linux 7.3 box in the middle.
They are 10.4.2.0 and 10.4.7.0. There are a couple of boxes on each
network,
but I can't ping a box on one network from the other.
 
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
217.78.4.128    *               255.255.255.192 U     0      0        0
eth2
10.4.7.0        *               255.255.255.0   U     0      0        0
eth3
10.4.2.0        *               255.255.255.0   U     0      0        0
eth0
192.168.200.0   *               255.255.255.0   U     0      0        0
eth1
127.0.0.0       *               255.0.0.0       U     0      0        0
lo
default         217.78.4.190    0.0.0.0         UG    0      0        0
eth2

The above is the routing table of the machine. All iptables policies are
set to accept.
I can access the internet fine from the 192 and 10 networks, as
masquerading is enabled on eth2.
However, I do not want to masquerade the address from 10.4.2.0 onto
10.4.7.0 
and vice-versa.
Am I missing something obvious?
Cheers,
Dave.
 

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Re: [LARTC] Routing between two RFC1918 networks.

[Jason A. Pattie]

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Just a hunch: is forwarding enabled? i.e., 'echo 1 >
/proc/sys/net/ipv4/ip_forward'

Dave Hunt wrote:
>
> Hi all,
>
> I've two RFC1918 networks with a RedHat Linux 7.3 box in the middle.
> They are 10.4.2.0 and 10.4.7.0. There are a couple of boxes on each
network,
> but I can't ping a box on one network from the other.
>
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 217.78.4.128    *               255.255.255.192 U     0      0
0 eth2
> 10.4.7.0        *               255.255.255.0   U     0      0
0 eth3
> 10.4.2.0        *               255.255.255.0   U     0      0
0 eth0
> 192.168.200.0   *               255.255.255.0   U     0      0
0 eth1
> 127.0.0.0       *               255.0.0.0       U     0      0        0 lo
> default         217.78.4.190    0.0.0.0         UG    0      0
0 eth2
> The above is the routing table of the machine. All iptables policies are
> set to accept.
> I can access the internet fine from the 192 and 10 networks, as
> masquerading is enabled on eth2.
> However, I do not want to masquerade the address from 10.4.2.0 onto
> 10.4.7.0
> and vice-versa.
> Am I missing something obvious?
> Cheers,
> Dave.
>
>
> --
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- --
Jason A. Pattie
pattieja@pcxperience.com
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