Looking for any assistance/insight regarding the following environment:
Internet <-> Eagle Raptor NT 4.0 <-> 16Mb TR's <-> T1 <-> 4Mb TR's
Our symptoms include intermittant HTTP "partial page loads" for users on
the 4Mb Token Ring networks. All proxy services working fine for staff
on the 16Mb TR's. Sniffer traces show that packets are coming in through
the firewall with MTU (max transfer unit) = 4500 and the "df" (don't
fragment) bit set ON. The Token Ring interfaces MTU are all set at 4500.
The CISCO has default MTU of 1500 for the serial T1 link, and thus
(according to RFC 1191), the router is to send a ICMP message back to
the source server, that in effect, requests a resend of the data with a
smaller MTU. Sniffer shows the ICMP is generated at the router, and
passes through the firewall, but no response is ever received from the
server on the Internet. Any clues as to what's going on here? Any other
Raptor NT 4.0 users (or other proxy-based firewalls) with similiar
environment? Thanks in advance for all input....
--------KANSAS DEPARTMENT OF HEALTH & ENVIRONMENT---------
---------------WWW.STATE.KS.US/PUBLIC/KDHE----------------
--------------Landon State Office Building----------------
------------------Phone (913) 296-5643--------------------
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