Solved!

On Sun, 06 Aug 2006 02:38, cr wrote:
> I've suddenly started having great trouble uploading JPGs of 50K or so to
> Trademe (our local New Zealand Ebay equivalent).   They seem to be
> 'choking' - that is, the first ~10K's go OK, then a slight gap, then a few
> more K's, then a longer gap, then a very few K's, then a still longer gap,
> and so on - it takes about 3 minutes to upload a 30K JPG!   (Bigger ones
> just time out).
>
> This is using Trademe's (javascript) upload page in a browser.   Up until
> ~2 weeks ago it worked fine.

(snip)

A kind list member said (in a private post)  "Maybe MTU problem"  
(I'd never heard of a MTU!)

For any other newbies' benefit - 
MTU = Max. Transmission Unit   ( roughly ~ packet size)
Typical values for use with PPP are 500-2000 (so Google says)

For ppp in Debian, can set it by uncommenting the line in 
/etc/ppp/options   to read e.g.
mtu 1024

In my case, 1024 improved things but wasn't the perfect cure, 
mtu 512  fixed things completely, I just did a 160K upload and it went 
straight through.

cr


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