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    [SOLVED] Re: Ping PCs through switch

    Many thanks Doug!!

    Indeed it was a firewall rule... now it works perfectly

    See ya and many thanks again! :D
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    [SOLVED] Re: Ping PCs through switch

    Thanks Doug

    Yes, it is a modem-router. So let's say PC1 is eth0 (192.168.0.1) and PC2 is eth0 (192.168.0.2) as reported by:

    ifconfig -a in every computer
    And someone at PC1 writes:

    ping...
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    [SOLVED] Ping PCs through switch

    My net setup is as follows:

    internet-----modem----switch----PC1
    |
    |
    -------PC2


    I'd like to ping PC2 from PC1...
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    [SOLVED] Re: Find my router's external IP

    That would mean firing up the browser, logging into the router, switching to the right tab in the web interface, etc. Too slow, plus this way you can't automatize any further task involving the...
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    [SOLVED] Re: Find my router's external IP

    Guys, many thanks again for all the answers. This is very enlightening for me :)


    This is kind of what I had in mind, but It was only a blurred idea, so thanks for the tip on ifconfig. I'll...
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    [SOLVED] Re: Find my router's external IP

    Thanks for all the help guys


    But I had a Linux software router (pppoe) running for years (I used the gateway node also as a workstation), and all i had to do was to grep my IP from ifconfig -a....
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    [SOLVED] Re: Find my router's external IP

    I thanked you by those but I am looking for a completely local solution, as I'd prefer to not use an external site for such a simple task when my router has all the needed data
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    [SOLVED] Re: Find my router's external IP

    Thank for the answers guys
    But I'd like to do everything from the bash console, since it is much easier than using the web interface.

    Not at all, but I set my old modem up (in router mode) using...
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    [SOLVED] Re: Find my router's external IP

    That's a very useful command, many thanks for your help

    But does anyone know if there's a local solution to this? It should be possible (and very basic stuff) to "talk" to the router, which is...
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    [SOLVED] Find my router's external IP

    Sorry for the question but i couldn't find anything relevant so far. My PC is connected to a HW router which in turn is connected to a modem


    internet-----modem----router----PC1

    Is there a...
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    [all variants] Re: hardware router + iptables

    Thanks Imarmisa. Yes they are Linux PCs, so you say I should be able to add non-NAT filter rules to PC1 and PC2 for opening/closing certain ports, for example?
    Because it seems that I can't use...
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    [all variants] hardware router + iptables

    My net setup is as follows:


    adsl modem --- adsl router --- PC1
    |
    |
    -- PC2


    The router's built-in...
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    [ubuntu] Re: 9.10: bootup screwed up

    Ok drs, I'll investigate further into dmesg.

    Again, thank you very much for your kind help
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    [ubuntu] Re: 9.10: bootup screwed up

    Many thanks drs! I followed your instructions and got it working.

    Thanks for the grub2 links, too. I'll start to tweak settings; didn't know it was so different from its predecessor.

    There's...
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    [ubuntu] 9.10: bootup screwed up

    In 8.10 I could change the grub setup so it showed up all bootup info text instead of the boot progress bar and ubuntu logo.

    With 9.10 I tried to do it as well (grub 2), but there's almost no info...
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    [kubuntu] Re: Cant' ping OWN eth0

    A gateway setup is not needed for this most basic ethernet connection. But I made the interfaces' new configuration persistent in /etc/network/interfaces and now I can reboot each machine...
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    [kubuntu] Re: Cant' ping OWN eth0

    Thanks for the help. However, the opposite *seems* to be the case. I reboot PC#1 and then of course I must do:

    sudo ifconfig eth0 192.168.0.1 netmask 255.255.255.0
    sudo ifconfig eth0 up
    ...
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    [kubuntu] Re: Cant' ping OWN eth0

    Well, I (kind of) found what was going wrong. I was taking for granted that only the ethernet interface of the rebooted PC needed to be reset and re-upped, but apparently even if only one of the two...
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    [kubuntu] Cant' ping OWN eth0

    I reinstalled kubuntu 8.04 in PC#1 and made no change to its configuration.

    Plugged the ethernet cable to the Realtek 8139/8139C/8139C+ card, the green light turned on. The machine at the other...
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    [kubuntu] Re: Can't ping the other PC

    Here it is:

    iptables -L

    Chain INPUT (policy ACCEPT)
    target prot opt source destination

    Chain FORWARD (policy ACCEPT)
    target prot opt source destination
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    [kubuntu] Re: Can't ping the other PC

    sudo iptables -L

    Chain INPUT (policy DROP)
    target prot opt source destination
    DROP icmp -- anywhere anywhere icmp echo-reply
    ACCEPT all -- ...
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    [kubuntu] Re: Can't ping the other PC

    Ok, thanks. But for now I only want to confirm that each PC can communicate with the other one. As I said, in Knoppix I can verify this with ping; something in Ubuntu seems to be conflicting with the...
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    [kubuntu] Re: Can't ping the other PC

    Sorry for the dumb question, but how can I determine that?
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    [kubuntu] Re: Can't ping the other PC

    Here's the ouput of "route" in PC#1:

    route

    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref Use Iface
    XXXXXXXXXXXXXXX * ...
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    [kubuntu] Re: Can't ping the other PC

    Yes, after boot up I write:

    In PC#1:

    sudo ifconfig eth1 192.168.0.1

    In PC#2:

    sudo ifconfig eth1 192.168.0.2
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