4 Oct
2004
4 Oct
'04
11:04 p.m.
My intent is to do SIP load balancing using a layer 4 hardware switch (such
as a Foundry ServerIron XL) or a layer 4 software switch (such as
UltraMonkey).
Since SER *could* operate in a completely stateless mode it could serve as a
per packet proxy in front of a series of stateful feature servers such as
Asterisk. A L4 device by itself would not be enough and a stateless MUST be
in front to do the actually balancing because of SIP's flaw/design of
containing routing information throughout the packets life. It would have
been nicer if it only carried a source and destination and worked more like
TCP/IP but unfortunately it is what it is.
Anyway, I about have everything working and I only seem to have a small
issue when the second SER server comes online with some strange message
passing between them. Most of it I believe is caused by my lack of
understanding of how SER makes some decisions on where to send things. I
think what would help is if I setup a "work in progress" web site that would
show all my config files and the layout of the whole thing along with an
explanation of why I decided to do what I did. I should have it up later
today or tomorrow.
----------------------------------------
Michael Shuler, C.E.O.
BitWise Communications, Inc. (CLEC) And BitWise Systems, Inc. (ISP)
682 High Point Lane
East Peoria, IL 61611
Office: (217) 585-0357
Cell: (309) 657-6365
Fax: (309) 213-3500
E-Mail: mike(a)bwsys.net
Customer Service: (877) 976-0711
-----Original Message-----
From: Jiri Kuthan [mailto:jiri@iptel.org]
Sent: Monday, October 04, 2004 5:42 PM
To: Michael Shuler; serusers(a)lists.iptel.org
Cc: jan(a)iptel.org
Subject: RE: [Serusers] forward() and t_relay() differences
At 07:50 PM 10/4/2004, Michael Shuler wrote:
Sorry if that first line sounded snotty, I
didn't mean it
that way. I
didn't read it until after I sent it. What I
meant to say
was thank you for
the response.
you are very welcome.
I had already been through the docs though and
found that too
but I was still seeing the following problem..
I am interestd in more feedback on load-balancers. To my
knowledge, it is
a technology which has some conflicts with SIP protocol and
those LBs that
try to fix the problems using built-in SIP awareness don't do
necessarily
any better. We are working on a SER built-in load-balancing
architecture
but that's still work in progress.
-jiri