[THIN] Re: Can Internet-based WAN links be reliable?
- From: "Joe Shonk" <joe.shonk@xxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Sun, 13 Mar 2005 18:03:11 -0700
Like Nick said, try bypassing the VPN... If you can, setup a CSG server and
try using that... Besides the VPNs gateway, other things to look at is the
firewall and any load-balancers in place.
Joe
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of kenw@xxxxxxxx
Sent: Sunday, March 13, 2005 11:41 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Can Internet-based WAN links be reliable?
I'm looking for anyone who has found a way to get good reliable Citrix
performance over the public Internet. Or is that an oxymonon?
I have several clients using Internet-based connectivity for Citrix support
of small remote offices. And I've just about run out of patience with
erratic performance.
Some sites seem to perform pretty well, some poorly, and the service is
quite variable. Clients complain of jerkiness, slowness, and hung or
dropped sessions.
I've been using Citrix for 10 years. I've tuned the TCP stacks, set up
keepalives, run packet traces, and so on. I've tried monitoring load, ping
times and packet loss with MRTG. About the only thing I've ever found that
really works is private networks -- but those are bloody expensive.
High ping times are a rough predicter of performance problems, especially
when combined with packet loss, or when due to very long haul or satellite
connections. My endpoints are rarely overloaded, so there's not much I can
do there.
There are expensive products that claim to optimize intersite performance,
but so far as I can see, those are all intended to optimise bandwidth on
congested llinks. They really don't seem to offer much for unreliable
connections with plenty of spare endpoint bandwidth, or for high-latency
satellite links. But I can't claim to have tested them much.
All of these offices are using DSL or Cable modems with static IPs and
IPsec VPNs between Netopia (R910 or equivalent) NAT routers. In some
cases, we also provide connections from remote individual PCs, using PPTP,
to those same routers. None of these sites are currently using "bare" ICA
sessions through open ports on the routers. I don't believe these issues
are related to the use of VPN connections, but I can't swear to it.
So I'm looking for success stories. What really works?
/kenw
Ken Wallewein
K&M Systems Integration
Phone (403)274-7848
Fax (403)275-4535
kenw@xxxxxxxx
www.kmsi.net
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