Hi, all,
I have a subnet consist of a 2610XM router, a catalyst 2950(24 port). Since my router has only one FE port, it's configured as below:
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interface FastEthernet0/0
description CONNECTION TO CISCO_SW_PORT_24
no ip address
no ip proxy-arp
speed 100
full-duplex
no cdp enable
no mop enabled
!
interface FastEthernet0/0.2
description VLAN2_connect_to_outside
encapsulation dot1Q 2
ip address assigned_ip_addr 255.255.255.0
ip nat outside
ip virtual-reassembly
!
interface FastEthernet0/0.3
description VLAN3_192.168.1.0_inside_net
encapsulation dot1Q 3
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly
!
interface FastEthernet0/0.4
description VLAN4 _192.168.3.0_inside_net
encapsulation dot1Q 4
ip address 192.168.3.1 255.255.255.0
ip nat inside
ip virtual-reassembly
!
interface FastEthernet0/0.5
description VLAN5_192.168.4.0_inside_net
encapsulation dot1Q 5
ip address 192.168.4.1 255.255.255.0
ip nat inside
ip virtual-reassembly
ip route 0.0.0.0 0.0.0.0 assigned_ip_addr_gateway
!
ip nat pool blackout assigned_ip_addr assigned_ip_addr netmask 255.255.255.0
ip nat inside source list 101 pool blackout overload
ip nat inside source static 192.168.1.100 assigned_ip_addr
access-list 101 permit ......
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The internal ip address 192.168.1.100 is assigned to a Fedora machine acting as a webserver, accessing vlan3. And the router FE port is connecting to one of the SW port as
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interface FastEthernet0/24
description TRUNK_CONNECTION_2610ROUTER_FE0/0
switchport mode trunk
no ip address
duplex full
speed 100
!
ip default-gateway 192.168.1.1
ip http server
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The whole system works fine for above configuration. Now I want to add WCCP to the router as:
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ip wccp web-cache
!
interface FastEthernet0/0.3
description VLAN3_192.168.1.0_inside_net
encapsulation dot1Q 3
ip address 192.168.1.1 255.255.255.0
ip wccp web-cache redirect in
ip nat inside
ip virtual-reassembly
!
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Then, when I try a "show ip wccp" command on the router, the output looks like:
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router#show ip wccp
Global WCCP information:
Router information:
Router Identifier: 192.168.4.1
Protocol Version: 2.0
Service Identifier: web-cache
Number of Service Group Clients: 1
Number of Service Group Routers: 1
Total Packets s/w Redirected: 4236
Process: 34
Fast: 0
CEF: 4202
Service mode: Open
......
========================================
It seems that the WCCP command is successfully sending packet to the server, becauce on the sever, when I try "tcpdump -n -i eth0 ip proto gre" the output looks like:
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..........................
11:59:55.285674 IP 192.168.4.1 > 192.168.1.100: GREv0, length 68: gre-proto-0x883e
11:59:56.013556 IP 192.168.4.1 > 192.168.1.100: GREv0, length 68: gre-proto-0x883e
.........................
===============================================================
Here is my question: WHY THE ROUTER IDENTIFIER IS 192.168.4.1 WHILE NOT 192.168.1.1
The ip address 192.168.4.1 is in VLAN5 and I believe I did nothing to this VLAN both for the router configuration and the switch configuration. I just don't understand why wccp chooses FE0/0.5 as the router identifier.
Thanks in advance for any explanation.
Joe
