Cisco 7604 Configuration Guide - Page 504
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SIP Inspection Chapter 22 Applying Application Layer Protocol Inspection Each phone IP address is translated to an external dummy IP address that is not in a network connected to the FWSM. The translated IP address should not be in a network connected to the FWSM. hostname(config)# access-group voice in interface outside hostname(config)# access-group voice in interface inside hostname(config)# route outside 10.3.0.0 255.0.0.0 10.2.0.5 1 Configure route to10.3.0.0 via 10.2.0.5 (IP address of the next hop router): hostname(config)# route outside 209.165.201.0 255.0.0.0 10.2.0.5 1 hostname(config)# ! hostname(config)# policy-map global_policy hostname(config-pmap)# class inspection_default hostname(config-pmap-c)# inspect dns maximum-length 512 hostname(config-pmap-c)# inspect ftp hostname(config-pmap-c)# inspect h323 h225 hostname(config-pmap-c)# inspect h323 ras hostname(config-pmap-c)# inspect rsh hostname(config-pmap-c)# inspect smtp hostname(config-pmap-c)# inspect sqlnet hostname(config-pmap-c)# inspect skinny hostname(config-pmap-c)# inspect sunrpc hostname(config-pmap-c)# inspect xdmcp hostname(config-pmap-c)# inspect netbios hostname(config-pmap-c)# inspect tftp hostname(config-pmap-c)# inspect sip privacy Router configuration: hostname(config)# interface GigabitEthernet0/2 hostname(config-if)# ip address 10.2.0.5 255.0.0.0 hostname(config-if)# ip policy route-map privacy hostname(config-if)# duplex auto hostname(config-if)# speed auto hostname(config-if)# media-type rj45 hostname(config-if)# no negotiation auto hostname(config-if)# ! hostname(config)# interface GigabitEthernet0/3 hostname(config-if)# ip address 209.165.201.1 255.0.0.0 hostname(config-if)# duplex auto hostname(config-if)# speed auto hostname(config-if)# media-type rj45 hostname(config-if)# no negotiation auto hostname(config-if)# ! hostname(config-if)# ip route 10.3.0.0 255.0.0.0 10.2.0.10 hostname(config-if)# ip route 50.0.0.0 255.0.0.0 12.0.0.10 Configured route to 10.3.0.0 and 209.165.201.0 reachable via 10.2.0.10 (IP address of FWSM). hostname(config)# access-list 10 permit ip any 10.3.0.0 0.255.255.255 hostname(config)# ! hostname(config)# route-map privacy permit 10 hostname(config-if)# match ip address 100 hostname(config-if)# set ip next-hop 10.2.0.10 Route map is configured to capture any packets destined for 10.3.0.0 network to be sent to 10.2.0.10 (IP address of FWSM). The show conn output at the FWSM shows that voice traffic is getting switched via the FWSM module and hiding each phone IP address. RTP traffic is not switched via the same subnet. Instead it is getting routed via the FWSM. hostname(config)# show conn 6 in use, 28 most used 22-88 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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