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Advanced Routing Problems. Wireless NIC + Wired NIC living in harmony.

Discussion in 'Networking' started by tryptych, May 2, 2010.

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  1. tryptych

    tryptych Thread Starter

    Joined:
    May 2, 2010
    Messages:
    1
    Ok.. bare with me.. this will be long and might make your head hurt.

    The situation: My laptop has two network cards, they are both in use. My wired nic is connected
    to my office, my wireless is connected to my personal wifi connection. I'm ccna/mcse certified and
    know a bit about these things. In theory using two nics shouldn't create so many problems, the routing
    table should sort itself out using metrics. In reality its a bit more complicated, and the more I
    test the more it seems there must be other variables involved. I wish there was an app to assist with
    this, manually messing with my routing table is getting annoying. Anyways, here is what happens when
    I turn both cards on:

    ( IP 8.152.35.198 = WIRED, INTERFACE #12 )
    ( IP 192.168.97 = WIRELESS, INTERFACE #16 )


    IPv4-Route-Table
    ===========================================================================
    Active-Routes:
    Network-Destination--------Netmask----------Gateway-------Interface--Metric
    ----------0.0.0.0----------0.0.0.0-------8.152.35.1-----8.152.35.198-----20
    ----------0.0.0.0----------0.0.0.0----192.168.1.254-----192.168.1.87-----30
    -------8.152.35.0----255.255.255.0---------On-link------8.152.35.198----276
    -----8.152.35.198--255.255.255.255---------On-link------8.152.35.198----276
    -----8.152.35.255--255.255.255.255---------On-link------8.152.35.198----276
    --------127.0.0.0--------255.0.0.0---------On-link---------127.0.0.1----306
    --------127.0.0.1--255.255.255.255---------On-link---------127.0.0.1----306
    --127.255.255.255--255.255.255.255---------On-link---------127.0.0.1----306
    ------192.168.1.0----255.255.255.0---------On-link------192.168.1.87----286
    -----192.168.1.87--255.255.255.255---------On-link------192.168.1.87----286
    ----192.168.1.255--255.255.255.255---------On-link------192.168.1.87----286
    --------224.0.0.0--------240.0.0.0---------On-link---------127.0.0.1----306
    --------224.0.0.0--------240.0.0.0---------On-link------8.152.35.198----276
    --------224.0.0.0--------240.0.0.0---------On-link------192.168.1.87----286
    --255.255.255.255--255.255.255.255---------On-link---------127.0.0.1----306
    --255.255.255.255--255.255.255.255---------On-link------8.152.35.198----276
    --255.255.255.255--255.255.255.255---------On-link------192.168.1.87----286
    ===========================================================================


    As you can see, that is pretty straight forward so far. Any IP address not currently listed there should be routed to the 8.152.35.1 gateway, because it's metric is lower then the 192.168.1.254 gateway.

    But immediately there are problems and a bunch of odd behaviour is noticed.

    #1 - I can ping 8.152.35.1 (wired gateway)
    #2 - I can ping 192.168.1.254 (wireless gateway)
    #3 - I can ping 8.152.35.198 (wired nic) from 8.152.35.197 (another local box)
    #4 - I *cannot* ping 8.152.35.197 (going the other way)
    #5 - Synergy (a little app I use that shares mouse/keyboard between two computevrs) immediately starts up
    and is able to establish a connection between 8.152.35.198 (myself as server) and 8.152.35.197 (client).
    #6 - My outlook is unable to connect
    #7 - When I ping www.google.com it uses my wireless' DNS settings <my office has no dns>, but tries to send
    the ping through my wired connection (probably because of the metric).
    #8 - When I browse to www.google.com I get nothing. Note my office uses a proxy. But I try on two browsers, one set up
    with no proxy.

    There are a bunch of other odd things I notice, but you get the point by now. It's a mess. On the wired connection I'm unclear why local computers can connect to me (ie: synergy) but I cannot make a connection to them (ie: outlook). So I start messing around making my own manual entries in the routing table. For example this one:

    route add 74.0.0.0 mask 255.0.0.0 192.168.1.254 metric 1 if 16

    The intention is that I need to contact any IP address starting with 74.x.x.x it should go through the wireless
    connection (IF #16). The metric should be 1, the highest priority. But the result of this entry is this:

    IPv4-Route-Table
    ===========================================================================
    Active-Routes:
    Network-Destination--------Netmask----------Gateway-------Interface--Metric
    ---------74.0.0.0--------255.0.0.0----192.168.1.254-----192.168.1.87-----31



    As you can see it forced the metric to be 31. Which doesnt help me. Anyone know how to force it? Anyone ever been in a situation like this before? Is there any hope? :) Is there an app out there that might help straighten out my routing table?

    Thanks in advance
     
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