FC9 Linux gateways, VPN working, IP forwarding isn't

[Giany]

On Fri, Jan 23, 2009 at 7:55 PM, Gary Stainburn <
gary.stainburn at ringways.co.uk> wrote:

> Hi folks.
>
> I've given up on openswan because it won't work though my ADSL router.
>
> I've now got a very simple ppp-over-ssh VPN working using the following
> script
>
> /usr/sbin/pppd updetach noauth passive \
>  pty "ssh $HOST -P -o Batchmode=yes /usr/sbin/pppd nodetach notty noauth" \
>  $LocIP:$RemIP
>
> I'm using 192.167.127.1 and .2 for the VPN
>
> My local LAN is 10.6.0.0/16 and the remote is 10.1.0.0/16
>
> The VPN works, and from each end I can ssh to the remote end using either
> it's
> 192. or 10.  IP address.
>
> On each gateway, and on the test hosts on each LAN I have set up the
> appropriate routes. On each gateway I have enabled IP  Forwarding by
> running
>
> sysctl -w net.ipv4.ip_forward=1
>
> and made it permenant by editing /etc/sysctl.conf. I even rebooted to make
> sure.
>
> However, I cannot get anything to work except gateway to gateway. Anything
> behind the gateways cannot get past their local gateway.
>
> Anyone know what I've missed?



I guess its normal not to pass because the next gateways dont "know"  what
10.x/192.x ips are.
I think either you have to export those IPs to the next gateways either you
enable nat
for each VPN, smth like iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
(fastest
way) where eth0 is your interface for internet.

>
> --
> Gary Stainburn
>
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