From: Rick (rtmckinney@attbi.com)
Date: Sat May 31 2003 - 16:49:12 EDT
Everyone,
I had an odd situation .. maybe someone can shed some light on things
2 Sun V880's same OS 12/02 with the latest patch cluster ( don't
remember
what day for certain but I downloaded it and installed it on the same
day )
right before each system was shipped out ...
here is a simplified drawing of the configuration ( btw .. I didn't
design the
network)
at the bottom of the drawing you will see what I am having an issue
with
|Source Subnet |
|with multiple |
|Workstations |
| and |
|Servers |
--------------
|
------------------- Local Area Network ( sniff here Packet Size is
1500 )
| ( and it Don't Fragment is not set )
|
|
---------------
| Cisco Router |
| 1st set of IP |
| NATs occurs |
| here |
---------------
|
------------------- Wide Area Network
|
---------------
| Nokia IP 440 |
| Firewall |
| No NAT'ing |
---------------
|
|
-----------------
| Cisco Catalyst |
| Multiple VLAN's |
----------------
|
------------------- ( sniff here Packet Size is 1536 )
| ( and it Don't Fragment is not set )
|
---------------
| Nokia IP 330 |
| Firewall |
| No NAT'ing |
---------------
| |
| |
| |
------------------- ( sniff here Packet Size is 1544 )
| | ( see the MTU and MSS below the drawing )
| | ( and Left side negotiates fine
| | ( right side says Need To Fragment )
------------------- From Here Down Client Sites
/ \
/ \
/ \
/ \
------------ -------------
| Cisco | | Cisco |
| NAT Occurs | | NAT Occurs |
------------ ------------
| |
| |
| |
------------ ------------
| Cisco PIX | | Cisco PIX |
| No NAT'ing | | NO NAT'ing |
------------ ------------
| |
| |
---------------- ----------------
| Cisco Catalyst | | Cisco Catalyst |
---------------- ----------------
| |
| |
---------------- ----------------
| Sun Server | | Sun Server |
---------------- ----------------
| |
| |
This server This Server
Negotiates Negotiates
an MSS of 1360 an MSS of 1480
the NIC MTU the NIC MTU
is 1500 is 1500
the question is why does the left side Sun Server negotiate and pass
data
back while the right side Sun Server will not negotiate and pass data
back
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