Re: Adding SCTP support

The use case that I (and many others, I think) am interested in is
where you're doing

   client <---TCP---> proxy <----SCTP---> proxy <---TCP---> origin
server

Assuming that the TCP hops are short, and the SCTP is a long haul
(e.g., from Australia to the US).

On 03/06/2008, at 4:35 PM, Pranav Desai wrote:

>
>
> On Sun, Jun 1, 2008 at 5:32 PM, Mark Nottingham <mnot_at_yahoo-inc.com>
> wrote:
> I'm very interested in this, and would be willing to help with the
> spec work side of things. It's also been discussed on the HTTP
> mailing list <http://lists.w3.org/Archives/Public/ietf-http-wg/>.
>
> Cheers,
>
> Thanks you all for your responses. So as I expected its not as
> trivial as changing the protocol type in squid.
>
> From the paper mentioned in this thread by Matt, it looks like we
> need to have a mechanism to be able to handle multiple streams in
> parallel, without which the advantage of using SCTP wouldn't be that
> much. I believe that would be difficult in squid, due to the single
> process nature? What would be the right way to go about achieving
> this ?
>
> But, in general, it seems like a proxy would be a perfect place to
> use something like SCTP, especially where the origin server may not
> have SCTP support. It also seems like the client (browser) would be
> critical in how efficiently they can use the key features of SCTP,
> multi-streaming. So a combination of a custom browser (modified
> firefox) and squid could have some good advantage over TCP.
>
> -- Pranav
>
>
>
>
> On 01/06/2008, at 12:50 PM, Adrian Chadd wrote:
>
> Hi,
>
> I've spoken to some SCTP related people about this before.
> The trouble is:
>
> * NOone's fleshed out how HTTP over SCTP should look;
> * Noone's fleshed out how servers should choose HTTP over TCP vs SCTP.
>
> They're the much more pressing questions.
>
>
>
> Adrian
>
> On Sat, May 31, 2008, Pranav Desai wrote:
> Hello All,
>
> What would you suggest should be the way to include SCTP support in
> Squid 3.0 ?
>
> My assumption here is that SCTP would be useful for clients (which
> support SCTP) connecting using slow/lossy wireless type networks. My
> goal is to experiment and compare the performance against TCP for
> wireless networks.
>
> So, I started with that and was easily able to add a config option for
> client-side and change the corresponding function
> clientHttpConnectionsOpen() to set appropriate protocol type and it
> worked just fine. But that would make it an SCTP only proxy.
>
> We could also open up another listening port for SCTP, so that we can
> have both SCTP and TCP simultaneously, where the origin server side
> will always be TCP.
>
> But I feel that I am missing something here. So, I would really
> appreciate any suggestions or comments you may have.
>
> Thanks for your time.
>
> -- Pranav
>
> --
> - Xenion - http://www.xenion.com.au/ - VPS Hosting - Commercial
> Squid Support -
> - $25/pm entry-level VPSes w/ capped bandwidth charges available in
> WA -
>
> --
> Mark Nottingham mnot_at_yahoo-inc.com
>
>
>

--
Mark Nottingham       mnot_at_yahoo-inc.com