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<DIV>Hi Greger,</DIV>
<DIV>I enjoy reading your posts, thanks a lot for the great work you are doing for ser users! </DIV>
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<DIV>I am going to consider that kind of scenario as well (load balancer returning Virtual IP address). I think for such configuration server side has to keep session information and always forward a call to the right server. <BR><BR><B><I>"Greger V. Teigre" <greger@teigre.com></I></B> wrote:</DIV>
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<DIV>I was thinking about a load balancing scenario where the load balancer will replace the IP addresses.</DIV>
<DIV>g-)</DIV>
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<DIV>---- Original Message ----<BR>From: Tina<BR>To: Greger V. Teigre<BR>Sent: Wednesday, April 06, 2005 09:45 PM<BR>Subject: Re: [Serusers] still no help - usrloc synchronization<BR><BR>> Thank you for givingme the scenario with "restricted IP" NAT, I am<BR>> starting to find some acceptable solution. <BR>> Unfortunately, "one-public-IP" approach is not free from problems<BR>> also. If your SIP router inserts this "one-public-IP" into the VIA<BR>> header, the reply routing goes via wrong SIP server... <BR>> If your SIP server inserts its real-IP-address - the scenario<BR>> mentioned above is still not resolved. <BR>> Any comments?<BR>> Tina<BR>> <BR>> "Greger V. Teigre" <greger@teigre.com> wrote:<BR>> See inline.<BR>> <BR>>> If you use DNS server for load balancing... the client receives one<BR>>> of your domain IP addresses according to SRV. I don't see the problem<BR>>> with a call here, cause UAC asks the
address only once (before<BR>>> sending INVITE). UAC already has the IP for BYE/reINVITEs. So why<BR>>> would you replicate INVITEs?<BR>> <BR>> I would never replicate INVITEs, I would just make sure that they are<BR>> proxied through the correct SER server (i.e. IP). <BR>> <BR>> The problems depends on your setup. If you have SERs with different<BR>> IPs, ex UA1 has registered with server A and UA2 has registered with<BR>> server B: If UA2 wants to call UA1 and UA is behind an IP restricted<BR>> NAT, server A is stored in the NAT table of the NAT in front of UA1. <BR>> If server B sends an INVITE to UA1, the INVITE will be refused by<BR>> UA1's NAT. <BR>> This is why a "one public IP" in front of a load balancing<BR>> cluster probably is a good way to go. <BR>> <BR>>> If you use IPVS/LVS... I believe you can force SER to insert it's<BR>>> public IP into VIA, so there
is no problem with replies. With regard<BR>>> to another requests, I believe load balancer keeps connection<BR>>> template, then when another request comes it would be forwarded to<BR>>> the same ser.<BR>> <BR>> Yes. There are different "keys" to use to load balance SIP messages. <BR>> One good way from a NAT point of view is to use originating IP<BR>> address. What you must remember is that the problem is not on the<BR>> server side, but on the client side. The NAT will in many situations<BR>> stop incoming UDP packets if the originating ip:port is not already<BR>> stored in the NAT table. The Via header does not matter for the NAT.<BR>> g-)<BR>> <BR>>> Any comments?<BR>>> <BR>>> "Greger V. Teigre" <greger@teigre.com> wrote:<BR>>> Yes, I believe that is so. But still you get a problem if the NAT is<BR>>> restricted, port-restricted or symmetric... The best would be to load<BR>>>
balance and always make sure that a given client is handled through a<BR>>> given<BR>>> SER (REGISTER and INVITEs). That includes forwarding INVITEs from one<BR>>> SER to<BR>>> another... OR you must load balance in front of your servers with one<BR>>> common<BR>>> public IP.<BR>>> g-)<BR>>> <BR>>> Matt Schulte wrote:<BR>>>> Ack, I didn't even think about NAT. Would these be added before it<BR>>>> gets sent off to the second proxy? ie:<BR>>>> <BR>>>> if (!src_ip==blah.netlogic.net) {<BR>>>> add_rcv_param();<BR>>>> t_replicate("blah.netlogic.net", "999");<BR>>>> };<BR>>>> <BR>>>> -----Original Message-----<BR>>>> From: Greger V. Teigre [mailto:greger@teigre.com]<BR>>>> Sent: Tuesday, April 05, 2005 7:49 AM<BR>>>> To: Matt Schulte; kramarv@yahoo.com<BR>>>> ! ; Cc: serusers@lists.iptel.org<BR>>>> Subject: Re:
[Serusers] still no help - usrloc synchronization<BR>>>> <BR>>>> <BR>>>> Well, you still have the NAT issues unless you do load balancing and<BR>>>> your<BR>>>> SER servers have the same public IP.<BR>>>> Have you looked at 0.9.0 nathelper function add_rcv_param() ? It<BR>>>> will add received info to the contact header for the other SER to<BR>>>> process. Haven't really tried yet...<BR>>>> g-)<BR>>>> <BR>>>> Matt Schulte wrote:<BR>>>>> I'm starting to lean this direction, using t_replicate and all. I<BR>>>>> could never get usrloc (db mode) to function properly.. t_replicate<BR>>>>> is<BR>>>> <BR>>>>> a dirty but very effective workaround.<BR>>>>> <BR>>>>> -----Original Message-----<BR>>>>> From: Greger V. Teigre [mailto:greger@teigre.com]<BR>>>>> Sent: Saturday, April 02, 2005
1:33 AM<BR>>>>> To: kramarv@yahoo.com<BR>>>>> Cc: serusers@lists.iptel.org<BR>>>>> Subject: Re: [Serusers] still ! no help - usrloc synchronization<BR>>>>> <BR>>>>> <BR>>>>> Have a look at this thread:<BR>>>>> http://lists.iptel.org/pipermail/serusers/2005-January/014669.html<BR>>>>> g-)<BR>>>>> <BR>>>>> Java Rockx wrote:<BR>>>>>> Tina,<BR>>>>>> <BR>>>>>> I thought I saw you post the other day that you did not want to<BR>>>>>> use t_replicate(), however, this is probably your best bet to<BR>>>>>> getting this<BR>>>>> <BR>>>>>> to work, IMHO.<BR>>>>>> <BR>>>>>> Regards,<BR>>>>>> Paul<BR>>>>>> <BR>>>>>> On Apr 1, 2005 4:08 PM, Tina wrote:<BR>>>>> ! >><BR>>>>>>> Hi,
please help me, I'm stuck with it!!!!!<BR>>>>>>> I am trying to set up several sers with a shared MySQL database<BR>>>>>>> for location service.<BR>>>>>>> <BR>>>>>>> I set in each ser.cfg:<BR>>>>>>> <BR>>>>>>> modparam("usrloc", "db_mode", 2)<BR>>>>>>> modparam("usrloc",<BR>>>>>>> "db_url","sql://ser:heslo@192.168.25.163/ser")<BR>>>>>>> <BR>>>>>>> and the servers are not synchronized.<BR>>>>>>> The I set<BR>>>>>>> modparam("usrloc", "db_mode", 2)<BR>>>>>>> <BR>>>>>>> <BR>>>>>>> made UAC (Xlite) register to one of the servers.<BR>>>>>>> I see it via usrloc, but there is no record in "location" mySQL<BR>>>>>>> table....So others do not see the client and I'm unable to
make<BR>>>>>>> calls....<BR>>>>>>> <BR>>>>>>> <BR>>>>>>> Please help how to work with usrloc and mySQL...<BR>>>>>>> <BR>>>>>>> Tina,<BR>>>>>>> software engineer<BR>>>>>>> <BR>>>>>>> ________________________________<BR>>>>>>> Do you Yahoo!?<BR>>>>>>> Better first dates. More second dates. Yahoo! Personals<BR>>>>>>> <BR>>>>>>> <BR>>>>>>> _______________________________________________<BR>>>>>>> Serusers mailing list<BR>>>>>>> serusers@lists.iptel.org<BR>>>>>>> http://lists.iptel.org/mailman/listinfo/serusers <BR>>>>>>> <BR>>>>>>> <BR>>>>>>> <BR>>>>>> <BR>>>>>>
_______________________________________________<BR>>>>>> Serusers mailing list<BR>>>>>> serusers@lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers<BR>>>>> <BR>>>>> _______________________________________________<BR>>>>> Serusers mailing list<BR>>>>> serusers@lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers<BR>>> <BR>>> <BR>>> <BR>>> <BR>>> Yahoo! Messenger<BR>>> Show us what our next emoticon should look like. Join the fun.<BR>> <BR>> <BR>> Do you Yahoo!?<BR>> Better first dates. More second dates. Yahoo! Personals</DIV></BLOCKQUOTE></DIV><p>
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