On Wed, 19 Mar 2014 10:38:37 +0000 Wayne Stallwood wayne@digimatic.co.uk allegedly wrote:
I've seen this quite often on the 3 mobile network recently. I can have blistering performance for web traffic, speedtest results in the order of 10Mb/s but throttled ssh sessions to the point I can't even use an interactive shell.
Funny thing is on 3 it seems to be a bit region specific. I think perhaps they do something like shuffle web traffic through a transparent proxy and anything else which requires direct access is severely throttled.
It's probably something like that or that ssh traffic just isn't recognised as legitimate so doesn't get some traffic management rule applied.
I saw something similar to this on the t-mobile network a few yaers ago (but for TLS encrypted mail connections, not straight ssh). I commented at the time at :
http://baldric.net/2012/01/12/t-mobile-resets-its-policy/
Mike Cardwell over at grepular.com (referenced in the post above) wrote a pretty good post about the issue too. It is not beyond the realms of possibility that telcos are generally "discouraging" encrypted tunnels of any kind. So even a VPN may prove problematic. It may be worth experimenting with corkscrew to tunnel ssh over https (thus hiding the fact that you are using ssh).
Mick
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Mick Morgan gpg fingerprint: FC23 3338 F664 5E66 876B 72C0 0A1F E60B 5BAD D312 http://baldric.net
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