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    Ipfwadm and ipchains: is upgrade from slink safe ?
    Submitted by Anonymous on Wednesday, November 08, 2000 – 20:17
    “I am running a slink production server which does ipmasquerading and firewalling.
    I’d like to know if upgrading to potato will
    break things or if the rules will be converted to ipchains’ format.
    Being a Debian fan, I think the upgrade will be ok, but anyway, are there known issues ?”
    It seems that ipchains provides backwards compatibility with ipfwadm, but it’s still an interresting question. As a development – how are people finding iptables in the 2.4.x kernels. 2.4.0 can’t be all that far away and we have another firewall system to nail down.

    Any pointers to good guides on upgrading firewalls?

    –AGL

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    Subject: Re: Ipfwadm and ipchains: is upgrade from slink safe ?
    Author: juhtolv
    Date: Thursday, 2000/11/09 – 21:34
    I have had practically same firewall-script from the days of kernel-series 2.0.*. When I switched to 2.2.*-kernels, I took that old firewall-script, changed every ipfwadm to $TOOL. Then I added this text to the beginning of that script:

    if [ -f /proc/net/ip_fwchains ]; then
    TOOL=/sbin/ipfwadm-wrapper
    elif [ -f /proc/net/ip_input ]; then
    TOOL=/sbin/ipfwadm
    else
    echo It seems, that there is no firewall-support at all in your kernel, dork!
    Exiting… 1>&2
    exit 1
    fi

    And It Works For Me(TM), but YMMV

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    Subject: Re: Ipfwadm and ipchains: is upgrade from slink safe ?
    Author: alex
    Date: Thursday, 2000/11/09 – 07:46
    In my experience no, the ipfwadm rules were not handled well by the ipchains wrapper in potato.

    How many ipfwadm rules do you have? It isn’t hard to convert them to ipchains by hand if you don’t have many. Try http://snafu.freedom.org/linux2.2/ for docs.

    Of course if you can stay with your old 2.0 kernel, you don’t need to change the rules at all, the ipfwadm rules will keep working. Also, the good news about 2.4, if you consider using that, is that although it has a new system again (iptables?) it also allows you to load ipchains or ipfwadm kernel modules. Again, you could load the appropriate module and you don’t have to change your rules at all.

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