Hi, It sounds reasonable to "dispatch" the nat ping function from the core due to load. I'm trying to load share my clients based on DNS SRV and spread them over several OBP's. In my scenario I'm only ping'ing UA's without keep-alives implemented (flag'ing based on UA info in header). Fortunately these are not so many. That is why I wanted to see if the scenario I mentioend was possible. Looking forward to the updates. Thanks for your reply. Br, Helge Waastad Senior Engineer Smartnet tlf: 67830017 -----Original Message----- From: Andreas Granig [mailto:andreas.granig@inode.info] Sent: Wed 2/8/2006 8:55 PM To: Helge Waastad Cc: users(a)openser.org Subject: Re: [Users] Natping in "dispatcher scenario" Helge Waastad wrote: We ended up in implementing a simple stand-alone natping application for a proof-of-concept design using raw sockets for spoofing the OBP address, mainly for two reasons: - Performance: a possibility would be to evaluate the Path uri in the registrar and send a sip-based nat-ping (OPTION) with a pre-set route, but this would really stress the OBP (assume you've to ping 50.000 UACs every 60 seconds). - Simplicity: it would require quite a lot of changes in registrar/usrloc/nathelper/mediaproxy, so we just query the received-column of usrloc from the external natping application(s) and send empty udp packets. Patches to the registrar and a new path module for accomplishing this (inserting proper Path headers in an OBP, and taking the received-address from a Path uri parameter and saving it into usrloc in a registrar) will be contributed the next days... Bye, Andy