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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Loopbacks are only effective if you have more than 1 physical interface connected to the network. I have seen too many people think additional redundancy is provided simply by using loopback even though there is only one network link to the router.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Dennis Heim<br>Network Voice Engineer<br>CDW Advanced Technology Services<br>11711 N. Meridian Street, Suite 225<br>Carmel, IN 46032<br><br>317.569.4255 Office<br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>317.569.4201 Fax<br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>317.694.6070 Cell<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="mailto:dennis.heim@cdw.com" title="mailto:dennis.heim@berbee.com">dennis.heim@cdw.com</a><br></span><span style='color:#1F497D'><a href="http://www.cdw.com/content/solutions/unified-communications/">cdw.com/content/solutions/unified-communications/</a><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='color:#1F497D'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b>On Behalf Of </b>Lelio Fulgenzi<br><b>Sent:</b> Monday, June 14, 2010 3:12 PM<br><b>To:</b> Ted Nugent<br><b>Cc:</b> cisco-voip@puck.nether.net<br><b>Subject:</b> Re: [cisco-voip] GW IP Address in CCM<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>I usually go with loop backs. Remember, you need to have routing enabled though on the voice gateway so your loopbacks get advertised properly. Seems silly, but I don't think routing is turned on by default.<br><br>Lelio<br><br><br>---<br>Lelio Fulgenzi, B.A.<br>Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>Cooking with unix is easy. You just sed it and forget it. <br> - LFJ (with apologies to Mr. Popeil)<br><br><br>----- Original Message -----<br>From: "Ted Nugent" <tednugent73@gmail.com><br>To: "Jeff Ruttman" <ruttmanj@carewisc.org><br>Cc: cisco-voip@puck.nether.net<br>Sent: Monday, June 14, 2010 3:02:27 PM GMT -05:00 US/Canada Eastern<br>Subject: Re: [cisco-voip] GW IP Address in CCM<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>my experience has been that it will pick the hard interface that is connected closest to CM (Serial on WAN and ethernet on LAN)<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>I typically lock in the interface that I prefer with the mgcp bind commands to make certain i know where its getting bound<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>mgcp bind control source-interface FastEthernet0/1<br>mgcp bind media source-interface FastEthernet0/1<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>HTH Ted<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>On Mon, Jun 14, 2010 at 12:33 PM, Jeff Ruttman <<a href="mailto:ruttmanj@carewisc.org" target="_blank">ruttmanj@carewisc.org</a>> wrote:<o:p></o:p></span></p><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Hi,</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>I have a voice router configured, and in CCM an MGCP GW configured. I put the router on the LAN and all is well except CCM can't see the loopback interface, so the IP address on the CCM GW is the gig interface that is connecting the router to the network. Otherwise it appears that CCM did its MGCP config on the router just fine. Turns out CCM can't ping the loopback interface on the router.</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>I have the router connected ad hoc, not even on the specific network where it WILL be connected once in production. I assume there is something about the networking here that is preventing CCM from seeing the loopback as I'm currently setup. My questions:</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>When a newly configed CCM GW and voice router first meet, does CCM look for a loopback by default? And since it couldn't find one on the voice router, it chose the gig interface instead?</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>If I were to put the router on the proper network with the final IP address on the gig interface, and assuming the loopback interface is indeed now available to CCM, will it then use the loopback IP, or will I have to do something to make that happen.</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Loopback interface on router is Up Up.</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Thanks</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>jeff</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'> <o:p></o:p></span></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><br>_______________________________________________<br>cisco-voip mailing list<br><a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br><a href="https://puck.nether.net/mailman/listinfo/cisco-voip" target="_blank">https://puck.nether.net/mailman/listinfo/cisco-voip</a><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><br><br>_______________________________________________ cisco-voip mailing list <a href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a> <a href="https://puck.nether.net/mailman/listinfo/cisco-voip">https://puck.nether.net/mailman/listinfo/cisco-voip</a> <o:p></o:p></span></p></div></div></body></html>