Step 2 The packet goes to the route table, and the next-hop interface is
determined.
Step 3 The packet is encapsulated and sent out to the local interface.
No internal addresses are visible during this process. As a result, hosts do not have an
external public address, which leads to improved security.
By default, dynamic address translations time out from the NAT and PAT translation tables
after some period of nonuse. The default timeout periods differ among various protocols.
You can recon?¬?gure the default timeouts with the ip nat translation command. The syntax
for this command is as follows:
iipp nnaatt ttrraannssllaattiioonn { timeout | udp-timeout | dns-timeout | tcp-timeout | finrst-timeout |
icmp-timeout | pptp-timeout | syn-timeout | port-timeout} { seconds | nneevveerr}
Table 7-2 describes the parameters for this command.
Table 7-2 ip nat translation Parameters
Parameter Description
timeout Speci?¬?es that the timeout value applies to dynamic translations except
for overload translations. The default is 86,400 seconds (24 hours).
udp-timeout Speci?¬?es the timeout value for the UDP port. The default is 300 seconds
(5 minutes).
Pages:
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393