The setup works fine when a Cisco linksys is in place, but fails when a Cisco 881 is replaced in the place of Linksys. Mapping done, everything looks the same way on both routers. I don't think 881 come with inbuilt firewall?

On Mon, Aug 15, 2011 at 10:20 AM, John Doe Smith Kamau KipNg'etich Jones <skunkworks.ku@gmail.com> wrote:
ei... this is quite peculiar. internet access works... but not LAN access.

i'm a n00b... but i'd say its the firewall. i'm its been
mis-configured. I dont think has anything to do with NAT-ing... unless
u have two subnets, NAT cant be the issue. If the client comps and the
are connected to the same switch, then the mail server may have been
mis-configured to drop local-IPs... may be a mis-type was made
somewhere.... like 192.168.*1* instead on 192.168.*0*... something
like that. If the client machines can ping that server, then it must
be some misconfiguration somewhere...