Router User Manual

Nortel Secure Router 8000 Series
Troubleshooting - VAS Contents
Issue 01.01 (30 March 2009) Nortel Networks Inc. i
Contents
4 NAT troubleshooting ................................................................................................................4-1
4.1 NAT...............................................................................................................................................................4-2
4.1.1 NAT attributes......................................................................................................................................4-2
4.1.2 NAT modes ..........................................................................................................................................4-3
4.1.3 Special protocols supported by the address translation........................................................................4-3
4.2 Troubleshooting NAT Troubleshooting.........................................................................................................4-4
4.2.1 Typical Networking..............................................................................................................................4-4
4.2.2 Configuration notes..............................................................................................................................4-5
4.2.3 Troubleshooting flowchart ...................................................................................................................4-6
4.2.4 Troubleshooting procedures.................................................................................................................4-8
4.3 Troubleshooting cases ...................................................................................................................................4-9
4.3.1 Internal Network Cannot Successfully Ping the External Network After NAT Is Configured on the
Router ...........................................................................................................................................................
4-9
4.4 FAQs ...........................................................................................................................................................4-10
4.5 Diagnostic tools...........................................................................................................................................4-11
4.5.1 Display commands.............................................................................................................................4-11
4.5.2 Debugging commands........................................................................................................................4-19