[Olsr-users] IP Forwarding Issue on Windows Mobile 6.1 Platform

[Li Bing]

We are trying to run OLSRD on WM6.1 platform. First, we need to make sure
that WM6.1 supports IP forwarding. But we failed to make it work. Could
anybody give us some suggestions? The test scenario is as following

 

 

169.254.19.49/16                169.254.54.165/16

                  +--------|         a       +--------+         

                  |   PC1  |   -----------   | Mobile |  

                  +--------+                 +--------+ 

                        \                          |

                         \ c                    b  |

                          \                        |

                           \                       |

                            \                +---------+ 

                             \-------------- |  PC2    | 

                          169.254.160.194/16 +---------+

 

We setup an Wi-Fi ad-hoc network and 3 nodes involved. This is a full mesh
network. There is a direct wireless link 'c' between PC1 and PC2 and we
expect the IP packets path changed to be PC1--Mobile--PC2. The following
modifications are made to the devices. 

 

PC1  

----------------------------------------------------------------------------
------------

IP: 169.254.19.49/16

Routing Table:   

    Network Destination        Netmask          Gateway         Interface
Metric

             

          169.254.0.0      255.255.0.0          169.254.19.49
169.254.19.49       30

        169.254.19.49  255.255.255.255              127.0.0.1
127.0.0.1       30

      169.254.160.194  255.255.255.255         169.254.54.165
169.254.19.49       30

      169.254.255.255  255.255.255.255          169.254.19.49
169.254.19.49       30

Basically, the routing setting implies that 'to 169.254.160.194, the next
hop is 169.254.54.165'.

 

Registry setting:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Enable
ICMPRedirect = 0 

The purpose is to ignore possible ICMP redirect message from the mobile
phone which would change the route entry 169.254.160.194 back to a direct
network route.

 

 

Mobile:

----------------------------------------------------------------------------
------------

IP: 169.254. 54.165/16

Routing Table: 

    Network Destination        Netmask          Gateway         Interface
Metric

 

        169.254.0.0        255.255.0.0     169.254.160.194       0x3
25

      169.254.19.49    255.255.255.255      169.254.54.165       0x3
30

     169.254.54.165    255.255.255.255           127.0.0.1       0x3
30

    169.254.160.194    255.255.255.255      169.254.54.165       0x3
30

    169.254.255.255    255.255.255.255         169.254.2.1       0x30002
30

    169.254.255.255    255.255.255.255      169.254.54.165       0x3
30

     

Registry setting:

HKEY_LOCAL_MACHINE\Comm\Tcpip\Parms\IpEnableRouter = 1

HKEY_LOCAL_MACHINE\Comm\Tcpip\Parms\EnableICMPRedirects = 0

 

PC2 

----------------------------------------------------------------------------
------------

IP: 169.254.160.194/16 

Routing Table: 

    Network Destination        Netmask          Gateway         Interface
Metric

 

      169.254.0.0          255.255.0.0  169.254.160.194  169.254.160.194
25

    169.254.19.49      255.255.255.255   169.254.54.165  169.254.160.194
30

  169.254.160.194      255.255.255.255        127.0.0.1       127.0.0.1
25

  169.254.255.255      255.255.255.255      169.254.2.2     169.254.2.2
30

  169.254.255.255      255.255.255.255  169.254.160.194  169.254.160.194
25

Basically, the routing setting implies that 'to 169.254.19.49, the next hop
is 169.254.54.165'.

 

Registry setting:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Enable
ICMPRedirect = 0

 

IP traffic between PC1 and PC2 doesn't work after those configurations. Then
we did 'ping 169.254.19.49' from PC2 and we did get the ICMP replies. But
the packet sniffer shows that those replies are originated by the middle
node (source IP is 169.254.54.165) and no packets are received by
169.254.19.49. How come the mobile phone take the responsibility to answer
the ICMP reply for PC1 and it even does not check the reachability to PC1.It
seems there is some kind of proxy running on the mobile? Any configuration
we are missing?

 

Thanks.

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