BW )(: Weird cyclical lag pinging access point

[Peter Ferne]

We've just got a new ADSL2 connection in the Jiva office which works  
fine over wired ethernet but is behaving very strangely on the  
wireless. There's a ten to thirty second lag before a page loads. Once  
it starts loading it's very quick (c.12Mbps) but the horrendous  
latency is a killer.

As I said this only happens when connecting wirelessly. It's a  
Speedtouch (536 IIRC) wireless router and when I ping it I get the  
following cyclical pattern:

PING 192.168.1.254 (192.168.1.254): 56 data bytes
1361.759
  372.038
    1.954
    1.768
1055.497
1360.370
  363.406
    1.112
    1.210
1354.161
  361.835
    2.917
    1.314
1054.297
  369.234
    1.593
    1.291
1053.876
1357.369
  371.639
    1.319
    1.246

If I ping it on a wired connection I get a steady c. 1ms ping time.

Given that it's only a few feet away with a clear line of sight does  
anybody have any idea what might cause such *huge* variation in ping  
times over the course of a few seconds (c. 20s for the output above)?

I've had Be tech support on the phone and they got me to turn off a  
few checks by telnetting into the router:

{Administrator}=>firewall config tcpchecks=none
{Administrator}=>firewall config udpchecks=disabled
{Administrator}=>dsd config state=disabled
{Administrator}=>ids config state=disabled
{Administrator}=>ids config trace=disabled
{Administrator}=>saveall
{Administrator}=>exit

and to try switching to a different channel (although iStumbler shows  
no conflicting networks on nearby channels) neither of which seem to  
have had any affect at all.

Any suggestions gratefully received

TIA
--
petef

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