SMTP behind CISCO VPN

Hi all,

I have created a mail server, pop3 and SMTP server (in 1 pc), internal
users can send email successfully. However, when a user VPN from home
to internal network, cisco vpn give out 172.16.X.X/255.255.0.0 , when
user try to connect pop3 and smtp servers, it is fail, why?

internal : 10.0.100.0/255.255.255.0


Thanks.

(E-Mail Removed) wrote:
> Hi all,
>
> I have created a mail server, pop3 and SMTP server (in 1 pc), internal
> users can send email successfully. However, when a user VPN from home
> to internal network, cisco vpn give out 172.16.X.X/255.255.0.0 , when
> user try to connect pop3 and smtp servers, it is fail, why?
>
> internal : 10.0.100.0/255.255.255.0
>
>
> Thanks.
>
That's just not enough information. Is the VPN router at the site also
your default gateway router? If not, does the default gateway router
have a route to the VPN router? Can the VPN users ping the mail server?
Is there a firewall rule that permits only traffic on the internal
network to the server?

....kurt

Thx Kurt,

My case is I have only 1 router in a network, the router act as
gateway, vpn, internal router.

I can ping the mail server when i vpn to company at home, but cannot
telnet to mail server port 25 and 110. When i connected i can ping to
mail server 10.0.100.10/255.255.255.0, my vpn address is
172.16.0.10/255.255.0.0.

Then i try to /etc/rc.d/init.d/iptables stop, i cannot ping the mail
server. (the firewall rule is preseted by the linux when setup)