Re: [MMUSIC] Updating the pacing of ICE connectivity checks

[Martin Thomson <[e-mail]>]

On 15 February 2013 10:57, Dan Wing <[e-mail]> wrote:
> A quick a analysis of what browsers have been doing in this area:  The
> TCP retransmit timer on most OSs is 3 seconds.  But Firefox and Chrome
> have backup connection timers that are more aggressive (250ms and 300ms,
> if I recall correctly).  IE does not have a backup connection timer.  So
> they are not as aggressive as 20ms (which would be too aggressive on a lot
> of networks) but they also do not strictly follow the IETF TCP transport
> guidelines to retry a TCP connection after a long 3 seconds.

That's good info.  I could only find that for Firefox easily.  Given
that they also ignore the limit Dale pointed out and create 6
connections to any given server, this leads to an aggregate rate of
SYN packets of one every 50ms, though it's probably more bursty than
the even pacing required by RFC 5245.