inter-vlan routing strange problem

From: csc david (davidcsc2002@yahoo.com.cn)
Date: Sat Nov 26 2005 - 05:16:10 GMT-3


Hi, i have 2 routers: r1 r2, their fa0/0 are in trunk mode to link to cat2950 for vlan routing.
  r1(3745):
  int fa0/0
   no ip add
  int fa0/0.1
   encap dot1q 1 native
   ip add 10.103.1.7 255.255.255.0
  int fa0/0.2
   encap dot1q 2
   ip add 10.103.100.7 255.255.255.0
  int fa0/0.3
   encap dot1q 3
   ip add 10.103.103.7 255.255.255.0
   ip access-group 101 out
  router ospf 100
   network 10.103.0.0 0.0.255.255 area 103
   
  r2(2611):
    int fa0/0
   no ip add
  int fa0/0.1
   encap dot1q 1 native
   ip add 10.103.1.5 255.255.255.0
  int fa0/0.2
   encap dot1q 2
   ip add 10.103.100.5 255.255.255.0
  int fa0/0.3
   encap dot1q 3
   ip add 10.103.103.5 255.255.255.0
   ip access-group 101 out
    router ospf 100
   network 10.103.0.0 0.0.255.255 area 103
   
  topology:
  pc1----R1--2950--R2---wan---R3----pc2,pc3
   
  pc1 is 10.103.100.10(in vlan 2)
  pc2,pc3 is on remote site,linked by R3,R2, there is no access-list in R3.
  when pc1 ping pc2, it is ok, but ping pc3, it is unreachable. so I catch some packets on R1,R2,it is strange that when pc1 ping pc3,the returned icmp packets is blocked by vlan3's access-list, I wonder why pc of vlan2 communicate with remote pc will through vlan3?
  (the network config on pc2 and pc3 are same)
  Pls help

                
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