[THIN] Re: Retransmits
- From: "Lucas Boyken" <lboyken@xxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Thu, 3 Jul 2003 08:00:23 -0500
What kind of switches/routers are your servers attached to? If it is
Cisco equipment, make sure that each port on client/switch(router) side
are hard coded and not set to auto detect. This is a known problem with
Cisco's equipment. If running 100Mbps, set each port and client NIC to
100MBps/Full Duplex. See if that helps...
Respectfully,
Lucas W. Boyken
Computer Systems Associates
Account Manager / Technical Representative
lboyken@xxxxxxxxx
Company Phone: 800.222.7601
Office Phone: 515.332.2751
Fax: 515.332.5687
-----Original Message-----
From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]
Sent: Wednesday, July 02, 2003 5:02 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Retransmits
My boss is running Observer program, looking for retransmits.
And while we see some from other servers, we see A LOT from the Citrix
servers. Back to back. Excessive retries.
_____
From: John Knightly [mailto:jknightly@xxxxxxxxxxxxxxxxxx]
Sent: Wednesday, July 02, 2003 4:58 PM
To: thin@xxxxxxxxxxxxx
are you sniffing traffic?
-----Original Message-----
From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]
Sent: Wednesday, July 02, 2003 2:40 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Retransmits
No VPN, direct connections to remote sites.
_____
From: John Knightly
[mailto:jknightly@xxxxxxxxxxxxxxxxxx]
Sent: Wednesday, July 02, 2003 4:22 PM
To: thin@xxxxxxxxxxxxx
Looks like a good one...is there a VPN involved? IPSEC
overhead will frag ICA packets to hell and back, causing dropped
packets. Lowering the MTU is the only fix i'm aware of (or get rid of
the VPN tunell).
John
-----Original Message-----
From: Henry Sieff [mailto:hsieff@xxxxxxxxxxxx]
Sent: Wednesday, July 02, 2003 2:12 PM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Re: Retransmits
Things I would look into:
1) If you have alot of WAN clients, your router
could be dropping packets. This can happen for alot of reasons, but its
a vicious cycle. Router drops packets, servers retransmit which
increases load, which causes router to drop packets.
2) Mismatched duplex settings can cause this, on
occasion.
How are you seeing the retransmissions? (IE are
you sniffing, and if so, where are you sniffing the traffic from in
relation to the server?
-----Original Message-----
From: Schneider, Chad M.
[mailto:CMSchneider@xxxxxxxxx]
Sent: Wednesday, July 02, 2003 3:56 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Retransmits
Importance: High
Any seen a situation where Citrix causes
a TON of retransmits? I am seeing nearly ever packet being
retransmitted. We are now seeing slower links being unable to handle
the load.
Chad Schneider
Technology Analyst
Bemis IT
920-303-7609
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