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Ethernet issue: works one way but not another - FreeBSD

This one has got me stumped. Been working on it for 3 days now with no resolution. Please help. I have a 686 system that I just installed 5.3 on through ftp. So I know that my network setup works. I have 2 networks that I am trying to access through. One network is connected to a 100mb 3com hub using private ips into a firewall. This one works with no problems. The problem comes when I connect the system to the other network. This network is connected through a Breezecom wireless radio at 10mb. I can see that the ...

  1. #1

    Default Ethernet issue: works one way but not another

    This one has got me stumped. Been working on it for 3 days now with
    no resolution. Please help.

    I have a 686 system that I just installed 5.3 on through ftp. So I
    know that my network setup works. I have 2 networks that I am trying
    to access through. One network is connected to a 100mb 3com hub using
    private ips into a firewall. This one works with no problems.

    The problem comes when I connect the system to the other network. This
    network is connected through a Breezecom wireless radio at 10mb. I
    can see that the network is up, ip address is assigned, routes are set
    correctly. Pings time out. No traffic appears to cross from radio.
    Plug windoze box to radio, works fine. Plug radio into 10mb hub and
    plug FBSD server and windoze box to hub, same results on both. I can
    ping FBSD from windoze. FBSD still sees nothing. If I run tcpdump,
    wait 10 sec, hit ctl-C, nothing happens for 2.5 min. 1 packet is
    displayed and exit reports 1 packet captured, 6775 packets received by
    filter, 6094 packets dropped by kernel.

    I have tried 3 different network cards, each has the same results.
    Card 1: 3Com 3C905B, card 2: SMC 9432TX, card 3: Generic 10mb card by
    Realtec

    I know that the obvious answer is to connect the server through my
    firewalled connection, but I have a need to access another part of my
    company network from my desk and the wireless net is the easiest way
    to do this.

    Any and all help is greatly appreciated.

    TIA,
    John Guest

  2. #2

    Default Re: Ethernet issue: works one way but not another

    On Wed, 16 Mar 2005 21:06:32 -0500, John Allesee <com> wrote: 

    Well I am sure some one well help you if you provide more information
    about your network configuration/firewall rules,etc...

    Do you have a firewall configured on the freebsd box/M$windoze?

    --
    Kind regards
    Abu Khaled
    abu Guest

  3. #3

    Default Re: Ethernet issue: works one way but not another

    The system uses a standard installation. I have only configured the
    ethernet card with the proper ip address for the wireless side of the
    network. The windoze box is running M$ firewall, but it works fine
    and allows me to ping my gateway and the FBSD box. What concerns me
    at this point is the fact that tcpdump takes so long to respond. If I
    let it run, it will display a packet about one every 2 min. They seem
    to be in time order with timestamps only ms apart.

    Let me know if any other information will help.

    John A.



    On Thu, 17 Mar 2005 04:16:51 +0200, abu khaled <com> wrote: 
    John Guest

  4. #4

    Default Re: Ethernet issue: works one way but not another

    On Thu, 17 Mar 2005 11:21:44 -0500, John A. <com> wrote: 

    First, you have to excuse my English it is my third language and I do
    not have that much experience.

    This seems like a puzzle to me and I cannot figure out the topology of
    your network.

    * Can you ping the M$ box from FreeBSD? You need to enable incoming
    echo request in M$ firewall.
    * Are both systems on the same subnet?
    * Have you tried to plug the radio directly into FreeBSD box and test
    the connection like you did for M$ box?
    * Does your FreeBSD box have a firewall configured?

    You mentioned that the connection works if you plug the radio directly
    to M$ box. Does it also work when you plug both to the hub? If not
    then it might be a crossover cable problem.

    As you can see, many pices in this puzzle need sorting out.

    --
    Kind regards
    Abu Khaled
    abu Guest

  5. #5

    Default Re: Ethernet issue: works one way but not another

    No problem with the english, if you didn't mention it, I wouldn't have known.

    I can ping FBSD from M$, can't ping anything from FBSD.

    M$ box works when plugged into hub and directly into radio.

    All systems are on same subnet.

    FBSD box worked when plugged into a 100mb hub, but doesn't work when
    plugged into 10mb hub or directly into radio. Both hubs are 3Com and
    are working with other systems plugged into them.

    FBSD has no firwall configured. All I did was perform a standard
    installation loading all binaries and sources from ftp.

    I just tested another FBSD 5.3 box that I have and it does the same
    thing, works fine at 100mb, but appears to get lost at 10mb.

    Hope this answers some of your questions.

    John A.

    On Fri, 18 Mar 2005 01:18:46 +0200, abu khaled <com> wrote: 
    John Guest

  6. #6

    Default Re: Ethernet issue: works one way but not another

    On Thu, 17 Mar 2005 22:43:15 -0500, John A. <com> wrote: 

    If the other machines you are trying to ping have M$ firewall enabled,
    then you need to enable incoming echo request in the M$ firewall ICMP
    page.
     

    Try to check the output of "ifconfig" on the FreeBSD box when you
    connect it to the 100m hub / 10m hub / radio.
    Also try "route get <M$ BOX IP>" on the FreeBSD box and check the
    output. Does it provide the correct interface/gateway?
     

    Am I the only one interested in this topic? Where is the rest of our
    lovely community?
    Come on guys let's scratch those gray cells and help John out.

    --
    Kind regards
    Abu Khaled
    Abu Guest

  7. #7

    Default Re: Ethernet issue: works one way but not another

    Abu Khaled wrote:
    .... 

    Although progress is being made on getting detail, it's still
    insufficient (and, not entirely consistent? if the connection in
    question is *wired* then probably the fact that a wireless access
    point exists on the same subnet is not likely relevant). Anyway, I
    do not have a clear vision of what connects to what, how.

    The relevant portions of rc.conf, ifconfig output (and ipconfig
    output from the M$ box), the syntax of the tcpdump, the specs of the
    box, and other relevant details might spur more response. A simple
    ASCII representation of the network might help.

    FWIW, I've seen tcpdump behave poorly if the box or card just
    doesn't have the horsepower required to p the volume of all the
    packets being seen on the network.

    re: can't ping M$ box... M$ firewall sounds like the most likely
    culprit. If you try to ping and get no response, does the M$ box
    nevertheless show up in FreeBSD's arp table (compare arp -an before
    and after the ping test)? If the MAC address shows up, you've got
    connectivity just fine, but something's dropping the ICMP packets.

    PS to Abu -- your written English is as good or better than many
    native speakers of the language, so don't apologize for it. =)

    --
    Greg Barniskis, Computer Systems Integrator
    South Central Library System (SCLS)
    Library Interchange Network (LINK)
    <gregb at scls.lib.wi.us>, (608) 266-6348
    Greg Guest

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    Default Re: Ethernet issue: works one way but not another

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