Cisco 7604 Configuration Guide - Page 603
Network Sketch with Interfaces, Routers, and Hosts, Ping Failure at FWSM Interface
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Chapter 26 Troubleshooting the Firewall Services Module Testing Your Configuration Figure 26-1 Network Sketch with Interfaces, Routers, and Hosts Host 10.1.1.56 Host 209.265.200.230 Host 10.1.3.6 10.1.1.2 MSFC 192.168.1.2 dmz1 192.1 68.1. 209.265.200.226 MSFC 10.1.3.2 209.165.201.2 MSFC outside 192.168.3.2 209.165.201.1 dmz3 security0 192.1 68.3. Routed FWSM dmz2 192.168.2.1 security40 192.168.2.2 MSFC 10.1.2.2 dmz4 inside 192.168.4.1 192.168.0.1 security80 security100 192.168.0.2 192.168.4.2 MSFC 10.1.0.2 MSFC 10.1.4.2 10.1.2.90 Host 10.1.0.34 Host 10.1.4.67 Host Host 209.165.201.24 209.165.201.1 MSFC 10.1.0.1 outside security0 Transp. FWSM 10.1.0.3 inside security100 10.1.0.2 MSFC 10.1.1.1 10.1.1.5 Host 132877 Step 2 Ping each FWSM interface from the directly connected routers. For transparent mode, ping the management IP address. This test ensures that the FWSM interfaces are active and that the interface configuration is correct. A ping might fail if the FWSM interface is not active, the interface configuration is incorrect, or if a switch between the FWSM and router is down (see Figure 26-2). In this case, no debug messages or system log messages appear on the FWSM, because the packet never reaches it. Figure 26-2 Ping Failure at FWSM Interface Ping ? 132878 Host MSFC FWSM If the ping reaches the FWSM, and the FWSM responds, you see debug messages like the following: ICMP echo reply (len 32 id 1 seq 256) 209.165.201.1 > 209.165.201.2 ICMP echo request (len 32 id 1 seq 512) 209.165.201.2 > 209.165.201.1 If the ping reply does not return to the router, then you might have a switch loop or redundant IP addresses (see Figure 26-3). OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 26-3
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