Re: [Full-Disclosure] Sidewinder G2

From: Michael Gale (
Date: 11/20/03

  • Next message: Nick FitzGerald: "Re: [Full-Disclosure] .hta virus analysys"
    Date: Thu, 20 Nov 2003 11:33:42 -0700

    So how about High Availability ?

    I have recently setup two slackware linux based firewalls with some
    nice iptables setup with lids (linux intrusion detection system) which
    locks down the kernel and makes the file system not writable :)

    Each firewall I setup High Availability ( so if one
    machine is down (non-responsive) the other one will take over.

    Also to help in the prevention of DOS attacks --- what about syn
    cookies ?


    On Thu, 20 Nov 2003 12:10:27 -0500
    Shawn McMahon <> wrote:

    > Schmehl, Paul L wrote:
    > >
    > > Maybe your network policy states that, but I would prefer for single
    > > point of failure devices to fail open, rather than closed. For us,
    > > network availability is a higher priority than protection is. If
    > > the firewall fails, I don't want the entire network down while we're
    > > waiting for a vendor to fix it. I'd be surprised if most networks
    > > aren't that way.
    > The problem with this, as I'm sure you know (but it bears repeating
    > for the peanut gallery) is that it turns any DoS on your firewall into
    > an instant security hole. That escalates the severity of DoS bugs on
    > the firewall, which greatly increases the need to upgrade it when
    > they're found, which can increase your downtime.

    Full-Disclosure - We believe in it.

  • Next message: Nick FitzGerald: "Re: [Full-Disclosure] .hta virus analysys"

    Relevant Pages

    • Advice for SOHO firewall gear?
      ... I'm planning to expand my home/hobby network from a small gateway-server ... would like advice on firewall gear. ... Firewalled routing from perimeter network to trusted network ... traditional two-router setup is also OK, so long as the initial cost ...
    • Re: VRRP on NOKIA (CheckPoint)
      ... > For the VRRP setup, do I have to take into account eth3c0's??? ... Primary FW Configure the two data networks to monitor each other. ... Once the Primary network is back up, it will preempt (to use a cisco ... hsrp term) the Secondary Firewall and become Master again (as its ...
    • Re: Linux Firewall or Netgear
      ... I am currently setting up a network ... a PC running a firewall or a small appliance ... you need to pick the one you are sure you can setup based on ... 2000 Advanced Server can be setup as a VPN Server and supports simple ...
    • Re: Linux Router
      ... > of my clients behind the firewall to see beyond the firewall. ... > My two network cards are setup as: ... > I rebooted the machine after the above network setup, ... pass out on $ext_if proto tcp all modulate state flags S/SA ...
    • intermittent network/firewall failure
      ... I've recently tried setting up a firewall for our office and tried ... everything works fine except i've been getting intermittent network ... everything is normal again (except when the network failure randomly ... btw, this is the setup: the box has 3 nics, ...