Page 854 of 910 Appendix A: NAT router requirements for NAT Traversal feature

553-3001-365 Standard 4.00 August 2005

Natcheck output

A NAT router using CONE NAT will have output similar to the following.

D:\natcheck>natcheck -v
server 1: pdos.lcs.mit.edu at 18.26.4.9:9856
server 2: tears.lcs.mit.edu at 18.26.4.77:9856
server 3: sure.lcs.mit.edu at 18.26.4.29:9856
Local TCP port: 1400
Local UDP port: 1401
Request 1 of 20...
Connection to server 2 complete
Server 1 reports my UDP address as 69.156.96.28:57283
Server 2 reports my UDP address as 69.156.96.28:57283
Server 3 reports my UDP address as 69.156.96.28:57283
Connection to server 1 complete
Server 1 reports my TCP address as 69.156.96.28:57281
Connection from 18.26.4.29:9856
Server 3 reports my TCP address as 69.156.96.28:57281
Request 2 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 3 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 4 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 5 of 20...
Loopback packet from 69.156.96.28 port 57285
Server 2 reports my TCP address as 69.156.96.28:57281
Initiated TCP server 3 connection
Initiated TCP loopback connection
Connection from 69.156.96.28:57289
Loopback received
Request 6 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 7 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 8 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 9 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 10 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 11 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 12 of 20...
Loopback packet from 69.156.96.28 port 57285
Request 13 of 20...
Loopback packet from 69.156.96.28 port 57285