I have Cisco-831.
Few days ago was changed dns on isp side and as result i changed it on my cisco-831.
After that on lan computers(Lan computers use as dns ip address of internal interface on
cisco-831) that are behind cisco 831 started to be problems with opening internet sites. When on
lan computers dns was changed to real dns of isp,everything is fine. But we have many branches and
dns was changed on many of them from time to time,but such problems never happend.
Part of config about dns, if it not enough i will add full one.
ip domain name ************
ip name-server ***.***.***.***(real dns of isp)
ip dns server
ip dns spoofing
ip nat inside source route-map NONAT interface Ethernet1 overload
ip nat inside source static tcp ***.***.***.***1 22 interface Ethernet1 22
!route-map NONAT - is done for vpn channel.
Thanks a lot in advance for help! BTW ,sorry my english.