Cisco 7604 Configuration Guide - Page 323
Configuring Xlate Bypass, Using Dynamic NAT and PAT
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Chapter 16 Configuring NAT Configuring Xlate Bypass Configuring Xlate Bypass By default, the FWSM creates NAT sessions for all connections even if you do not use NAT. To avoid running into the maximum NAT session limit, you can disable NAT sessions for untranslated traffic (called xlate bypass). See the "NAT Session (Xlate) Creation" section on page 16-13 for more information. To enable xlate bypass, enter the following command: hostname(config)# xlate-bypass To disable xlate bypass, enter the no form of the command. The following sample output from the show xlate detail command shows xlate bypass disabled. The bolded display output shows that all 16 connections require identity NAT xlates even though NAT is not explicitly configured for any of the connections. hostname# show xlate detail Flags: D - DNS, d - dump, I - identity, i - inside, n - no random, o - outside, r - portmap, s - static 16 in use, 16 most used NAT from inside:10.1.1.11 to outside:10.1.1.11 flags Ii NAT from inside:10.1.1.12 to outside:10.1.1.12 flags Ii NAT from inside:10.1.1.13 to outside:10.1.1.13 flags Ii NAT from inside:10.1.1.14 to outside:10.1.1.14 flags Ii NAT from inside:10.1.1.15 to outside:10.1.1.15 flags Ii ... NAT from inside:10.1.1.25 to outside:10.1.1.25 flags Ii NAT from inside:10.1.1.26 to outside:10.1.1.26 flags Ii. The following sample output from the show xlate detail command shows xlate bypass enabled. The bolded display output shows that of the 16 connections active, none require xlates. hostname# show xlate detail Flags: D - DNS, d - dump, I - identity, i - inside, n - no random, o - outside, r - portmap, s - static 0 in use, 16 most used The following sample output from the show xlate detail command shows xlate bypass enabled, but includes a static identity NAT configuration, which does require an xlate. hostname(config)# static (inside,outside) 10.1.1.20 10.1.1.20 netmask 255.255.255.255 hostname(config)# show xlate detail Flags: D - DNS, d - dump, I - identity, i - inside, n - no random, o - outside, r - portmap, s - static 1 in use, 16 most used NAT from inside:10.1.1.20 to outside:10.1.1.20 flags Isi Using Dynamic NAT and PAT This section describes how to configure dynamic NAT and PAT, and it includes the following topics: • Dynamic NAT and PAT Implementation, page 16-20 • Configuring Dynamic NAT or PAT, page 16-26 OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 16-19
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