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Re: [SLUG] Need a lesson in routing [WAS: memory]

On Sat, Feb 21, 2009 at 8:39 AM, Kyle <kl@xxxxxxxxxxx> wrote:
> It's all good. Keep the thoughts coming please.
> I actually use IMAP over SSL.

you can use openssl s_client in place of telnet to connect -
has a guide.

> But for good measure Telnetted (and
> Wiresharked) over both my SSL IMAP port and 25. Both responses come back
> PDQ. And Wireshark shows traffic moving from one host to the other and
> return. I'm pretty confident of my iptables setup as I have refined that
> over a period of years.
> Both NIC's in full-duplex (albeit negotiated down to 100Mbps for the switch
> behind the router.)
> Is there anything in sysctl.conf I can mess with other than the single;
> 'net.ipv4.ip_forward = 1' param which will help?
> If I switch off ipv6, will that help?
> ------------------------------------------------------------------------
> Kind Regards
> Kyle
> peter@xxxxxxxxxxxxxxxxxx wrote:
>> So, connexions to the  (imap? smtp?) mail server time out.  Can you run
>> wireshark on the server, and see what's happening?  Does the server
>> have a correct route to the clients?
>> If it's smtp, then try telnet from a client to the server (telnet
>> 25) on the inside of the firewall, while watching top on
>> the firewall.  What does the load look like?  Does the telnet session
>> time out?  During which part of the connexion?
> --
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