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Lab - Troubleshooting NAT Configurations
© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 7 of 14
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Gateway(config)# interface g0/1
Gateway(config-if)# no ip nat outside
Gateway(config-if)# ip nat inside
Gateway(config-if)# exit
Gateway(config)# interface s0/0/0
Gateway(config-if)# no ip nat outside
Gateway(config-if)# exit
Gateway(config)# interface s0/0/1
Gateway(config-if)# ip nat outside
Gateway(config-if)# exit
j. From PC-A, ping Lo0 on the ISP router. Do any NAT debug translations appear on the Gateway router?
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Yes
*Mar 18 23:53:50.707: NAT*: s=192.168.1.3->209.165.200.254, d=198.133.219.1 [187]
*Mar 18 23:53:50.715: NAT*: s=198.133.219.1, d=209.165.200.254->192.168.1.3 [187]
Gateway#
*Mar 18 23:53:51.711: NAT*: s=192.168.1.3->209.165.200.254, d=198.133.219.1 [188]
*Mar 18 23:53:51.719: NAT*: s=198.133.219.1, d=209.165.200.254->192.168.1.3 [188]
*Mar 18 23:53:52.707: NAT*: s=192.168.1.3->209.165.200.254, d=198.133.219.1 [189]
Gateway#
*Mar 18 23:53:52.715: NAT*: s=198.133.219.1, d=209.165.200.254->192.168.1.3 [189]
*Mar 18 23:53:53.707: NAT*: s=192.168.1.3->209.165.200.254, d=198.133.219.1 [190]
Gateway#
*Mar 18 23:53:53.715: NAT*: s=198.133.219.1, d=209.165.200.254->192.168.1.3 [190]
k. Use the show ip nat translations verbose command to verify static NAT functionality.
Note: The timeout value for ICMP is very short. If you do not see all the translations in the output, redo
the ping.
Gateway# show ip nat translations verbose
Pro Inside global Inside local Outside local Outside global
icmp 209.165.200.254:1 192.168.1.3:1 198.133.219.1:1 198.133.219.1:1
create 00:00:04, use 00:00:01 timeout:60000, left 00:00:58,
flags:
extended, use_count: 0, entry-id: 12, lc_entries: 0
--- 209.165.200.254 192.168.1.3 --- ---
create 00:30:09, use 00:00:04 timeout:0,
flags:
static, use_count: 1, entry-id: 2, lc_entries: 0
Is the static NAT translation occurring successfully? ____________________ Yes
If static NAT is not occurring, repeat the steps above to troubleshoot the configuration.