I have no idea why, but I've found that the wireless networks in use at O'Reilly events (such as the MySQL User Conference, were I am now) are quite hostile to anyone using Cisco's VPN client.


I guess I get my email but not reply to anything while I'm here.

How annoying.

Posted by jzawodn at April 19, 2005 11:25 AM

Reader Comments
# Glen Campbell said:

Really? I'm having no problems at all....

on April 19, 2005 11:41 AM
# Jeremy Zawodny said:

Yeah, it's a bit of a mystery to me. :-(

on April 19, 2005 11:45 AM
# Jonathan said:

Might want to check to see if UDP port 10000 is allowed. WHen I took a class @ Cisco it wasn't allowed and had to use TCP port 10000 to connect to my VPN, which required a change in things. That should fix it

on April 19, 2005 12:23 PM
# Onno said:

Have you tried enabling transparent tunneling on the Transport tab in your connection properties? IPSec over TCP has never failed me yet.

on April 19, 2005 12:23 PM
# Jeremy Zawodny said:

It's already set to do TCP on 10500.

on April 19, 2005 01:13 PM
# Glen Campbell said:

Well, I have to retract that. After working flawlessly yesterday and this morning, I can no longer connect since lunch.

on April 19, 2005 02:30 PM
# Philip Molter said:

We've had problems as well. Twice I've had to have our net admin reset the session for the conference IP. He calls it a "rogue session", where the VPN server thinks you're connected because it has a record, but the session is actually gone.

The packet loss over the VPN is horrendous, as well.

on April 19, 2005 02:35 PM
# Jonathan Disher said:

Well, yesterday in the middle of the Advanced MySQL Performance Tuning tutorial, the wireless totally stopped connecting to the outside world. As for VPN, we use PPTP and I haven't had any issues, thank goodness.

on April 19, 2005 02:43 PM
# Glen Campbell said:

Further info - no problems connecting in rooms F & G, but can't connect anywhere else.

on April 19, 2005 04:31 PM
# Damon said:

You might want to check your MTU on your wireless card. Oftentimes, particularly with DSL connections but sometimes on wireless, a high MTU will cause odd networking problems like being able to receive some things, but not others...usually has to do with the size of said "thing" (read: big emails).

A quick way to check if packets of a certain size are getting through is with ping:
ping -f -l 1500 google.com

on April 19, 2005 08:20 PM
# Kevin Scaldeferri said:

I'm not at MySQL, but I didn't have any problems at OSCON last year. Maybe the Overture VPN was set up slightly differently from the main Y! VPN? As I recall, packet loss was a big problem in or near the sessions, though. The less crowded lobby worked a lot better then.

on April 19, 2005 11:08 PM
# Premshree said:

...were I am now
You surely meant where? :-|

on April 20, 2005 02:33 AM
# David Hopper said:

Please try it now, I've opened 10500. We debugged our setup for Cisco's VPN via IPSec some events ago; we've had many clients connect fine using it. Please understand that we are proactive about such things; you needed only to speak to a conference staff member and they can direct us to open ports.

It's good we found this blog. Let us know if it works for you!

David Hopper
Global Event Services, Inc.

on April 20, 2005 09:40 AM
# Gina Blaber said:

Yes, if you're having problems with wireless (or any other aspect of the conference), please speak to an O'Reilly conference staff member, and we'll try to help sort out the problem. The staff people are wearing black tops that say "O'Reilly Conference Team".

Or send me email -- I'm gina@oreilly.com

Gina Blaber
Conference Director, O'Reilly

on April 20, 2005 11:24 AM
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