Hi,\n\nI've run into a problem with my Cisco setup and my ISP. Basically,\nthey won't do reverse DNS on our outgoing serial interface. I\ncurrently NAT everything from internal private LAN to this serial\ninterface. As my front end mail server is internal, that means it gets\nNAT'd on the way out to the serial interface. Some mail servers it\ntalks to require reverse looksup and it fails sending mail to them.\n\nMy serial interface is xxx.xxx.190.90 and the other end of the WAN link\nis xxx.xxx.190.89 these are the only two IP numbers in that subnet.\n\nMy router has 3 interfaces, a serial for the WAN, and two ethernet, one\nfor internal LAN one for a DMZ. The DMZ is xxx.xxx.168.224/240.\n\nI'm no guru at Ciscos that's for sure, but in generaly I can figure\nthings out if given an idea or any docs to read... is there a solution\nto this? Any pointers, suggested reading or whatever would be greatly\nappreciated.\n\nThanks for your help.