[pfSense Support] Strange TCP connection behavior 2.0 RC2 (+3)

Cameron Byrne cb.list6 at gmail.com
Tue Jun 28 16:16:13 UTC 2011

On Tue, Jun 28, 2011 at 9:11 AM, Leigh Porter
<leigh.porter at ukbroadband.com> wrote:
>> -----Original Message-----
>> From: Cameron Byrne [mailto:cb.list6 at gmail.com]
>> Sent: 28 June 2011 16:53
>> To: Leigh Porter
>> Cc: Andreas Ott; Eugen Leitl; williamejsalt at googlemail.com; NANOG list
>> Subject: Re: [pfSense Support] Strange TCP connection behavior 2.0 RC2
>> (+3)
>> In the 3G world, i have had good results overcoming longish RTT by
>> using the Hybla TCP algorithm  http://hybla.deis.unibo.it/
>> I am hoping it gets more default traction, especially in wireless
>> where the radio link is a pretty big latency source
>> Cameron
> How do you implement this for lots of clients and servers that have out of the box implementations? The FastSoft box is a TCP man-in-the-middle box that essentially implements the FAST TCP algorithm without either end having to worry about it.

You don't, the full benefits only come with a Linux kernel patch.  The
good news is that it only has to be implemented on the client end.

> I have also used home-fudged TCP proxies with some success.
> Some 3G/wireless/VSAT vendors implement their own TCP modification stacks but they usually only fiddle with window sizes and such.

That's why i said i hope it catches on as default :)  If Android
implemented Hybla, i think it would be a great improvement for user
experience.  Nobody likes the middleboxes that proxy TCP.... they cost
money, don't scale well, and are generally fragile.  Hybla is not a
solution for the OPs issue, just a solution for high RTT links where
the client can do Hybla.  It an evolutionary step that i think would
make a great fit in smartphones like Android.

> --
> Leigh
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