[SLUG] PostgreSQL and httpd weirdness

[Howard Lowndes <lannet@xxxxxxxxxxxxx>]

I have two servers which interact with each other.

One is a web server, let's call it W and the other is a PostgreSQL
server, let's call it S.

W sends sql commands to S, which sends back the response.

W sends a 50 byte request to S with its seq number correctly set
(3622504195) and the ack number correctly set to match the last seq from
S plus the payload of the last packet from S (3658609267)

S responds with a 1448 byte payload, it's seq is correct (3658609267)
and the ack reflects correctly the 50 byte payload from W (3622504245)

S then does a push ack with a payload of 126 so it's seq rises to
3658610715 and the ack remains at 3622504245.  This is the second part
of the response from S to W.

At this point W appears to lose the plot and instead of sending a zero
payload ack with seq 3622504245 and ack 3658610841 (= 3658610715 + 126),
it send a zero payload ack with seq 3622504245 and ack of 3658609267, as
if it never received the 1448 byte packet from S as well as ignoring the
126 byte push packet.

Needless to say S resend the big packet but W keeps insisting that it
wants it again.

At this point everything just hangs.

What would this be symptomatic of?  MTU problems?  NIC problems?  or
what.  I though it might be RAM but I have just recently upped that.


Both opsys are RH9.0.

-- 
Howard.
LANNet Computing Associates;
Your Linux people <http://www.lannetlinux.com>
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