Search:  

 
 
   All ForumsHot TopicsGallery






how-to block ads


 
Forums » VOIP etc » Voice Over IP - VOIP » VOIP Tech Chat » How multiple ATAs can be behind same NAT router?
Share Topic:
RSS topic:
toggle:
flat / full
normal / watch
Posting:
Post a:
Post a:
port from AT&T to Vitelity after dryline switch? »
« PAP2  
priller

join:2000-10-20
Gainesville, VA
·voip.ms
·Callcentric
·Vonage
·callwithus

Re: How multiple ATAs can be behind same NAT router?

said by artisticcheese See Profile :

I thought UDP are packets are sent and received on the same port number so on router side it shall be receiving also on 5060?
That's what you see on the "inside" of your network. But, the port is being changed before it leaves the WAN interface.

The combination of the IP address being translated, as well as the port, is what allows you to have multiple ATA's register to the same VoIP provider and not get confused.
priller

join:2000-10-20
Gainesville, VA
·voip.ms
·Callcentric
·Vonage
·callwithus

Re: How multiple ATAs can be behind same NAT router?

Click for full size
Packet on the inside
Click for full size
Packet after PAT
So, to demonstrate this in action. Here is a capture of the same session captured on both the inside interface and the outside interface. Note that port 5060 has been changed to 1061.

Forums » VOIP etc » Voice Over IP - VOIP » VOIP Tech Chatport from AT&T to Vitelity after dryline switch? »
« PAP2  


Friday, 04-Dec 13:31:48 Terms of Use | Privacy Policy | Hosting by www.nac.net - DSL,Hosting & Co-lo | feedback | contact
over 10 years online! © 1999-2009 dslreports.com.republican-creole
page compression OFF
Most commented news this week
· [163] Comcast Releasing Promised Usage Meter
· [144] Avast Antivirus Has Gone Mad
· [116] Comcast Makes NBC Universal Acquisition Official
· [104] Graduate Student Unveils Sprint's GPS Sharing With Feds
· [99] Google Invades ISP, OpenDNS Turf With Google Public DNS
· [81] Latest Consumer Reports Survey Not Kind To AT&T
· [74] Sprint Defuses GPS Privacy Media Bomb
· [74] FCC Ponders Moving From PSTN To IP Voice
· [70] Baltimore To Ban Lazy Cable Installs
· [64] Broadband Killed The Game Console
Most people now reading
· False positive in Avast! or is it real? [Security]
· Google takes aim at browser redirection [Security]
· Windows 7 boot manager editing questions [Microsoft Help]
· IMG 1.7 (IMG Updates and Discussion) [Verizon FIOS TV]
· An Excellent Guide About Google Voice And Sip Sorcery [VOIP Tech Chat]
· DNS options, what are YOU using? [TekSavvy]
· Warrior tank seem underpowered these days [World of Warcraft]
· [WotLK] Doing away w/ conquest? [World of Warcraft]
· [Scam] Cruise line mail? [Spam, Scam and Phishbusters]
· Linux is terrorist - according to MS... [All Things Unix]