On 31 July 2001, steve@??? said:
> I can't send large email messages from exim 3.12 (debian) to an Exchange
> server when passing packets through a CISCO PIX Firewall.
>
> It seems the CISCO PIX firewall doesn't like large packets:
>
> ping -s 2000 <mailserver ip> results in an addional 30ms latency,
> ping -s 3000 <mailserver ip> results in no packets being returned
> (the mail server is on an unloaded T1)
Looks like your firewall is broken or misconfigured.
AFAIK, Exim just uses the kernel's TCP stack like any other TCP
application. It doesn't have much say (if any) about how its data
stream is broken into TCP segments or IP datagrams.
I think there are kernel parameters you can tweak to change how the
kernel's TCP/IP stack behaves, but I don't know much about that stuff.
Consult a book about TCP/IP on Linux; this isn't really an Exim issue.
Greg
--
Greg Ward - software developer gward@???
MEMS Exchange http://www.mems-exchange.org
