[clug] VPN over Wireless
steve at namsys.com.au
Thu Jan 17 22:45:36 GMT 2008
I am having some difficulties running VPNs over wireless links and
wanted to know if anyone can offer help please.
I am using WinXP clients making a PPTP connection over Telstra NextG
wireless and ADSL links to a Snapgear Firewall box. The Snapgear is an
embedded Linux unit that offers simple VPN/Firewall services. What I
am finding is that the XP clients connecting via ADSL get very good
connection times. Over wireless though it is terrible.
I have recently trialled Netspeed's Longreach Wireless as an alternative
and had similar difficulties. On this I have tried decreasing the MTU
and found it does improve the service but it is still not real good.
What I was interested in was anyone else's experience and/or some
explanation as to why the wireless links should be so temperamental. I
would have thought the VPN was just a TCP connection and it should
handle traffic as normal. e.g. On the Netspeed link, I can do sustained
FTP downloads and have no difficulties. If it do an "ls -lRt" on a
terminal session over the VPN on wireless it clags and kills the link
almost immediately. What is the difference? I see there would be some
"vpn padding" around the data but it must be very susceptible to timing
Anyway, if anyone can offer suggestions on how to improve the link I
would be most grateful. I am stuck with the client systems and
protocols for now so I would like to really make the best of it.
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