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List:       linux-ha
Subject:    Re: [Linux-ha-dev] Issues with heartbeat and iproute
From:       Alan Robertson <alanr () unix ! sh>
Date:       2002-07-30 1:51:41
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Kevin Dwyer wrote:
> Hey folks, I'm attempting to run heartbeat on some firewalls and just ran
> into a problem.  We decided to go with fwbuilder as the method for
> deploying rulesets since people around here don't really want to futz with
> writing/maintaining a script to do it, and prefer a GUI.  That's fine, but
> the way that fwbuilder generates NAT rules (and it really is a superior
> way I think to that of my old method, creating lots of aliases) messes
> with heartbeat.  Specifically, it uses iproute to add aliases to a device,
> like eth0 in this example:
> 
> ip -f inet addr add ipa.ddr.ess.1 dev eth0 scope link
> ip -f inet addr add ipa.ddr.ess.2 dev eth0 scope link
> ip -f inet addr add ipa.ddr.ess.3 dev eth0 scope link
> ip -f inet addr add ipa.ddr.ess.4 dev eth0 scope link
> ip -f inet addr add ipa.ddr.ess.5 dev eth0 scope link
> 
> That's all fine, except that it causes really weird stuff to happen to the
> output of ifconfig.  For one, the inet addr: field will change once in a
> while if I make a modification with ifconfig.  That doesn't affect
> heartbeat, but the Bcast: field is wrongly reported as 0.0.0.0.  Now, I
> know for a fact that I set it correctly when I bring up the interface,
> prior to using the ip route commands.  Once they've been applied, it goes
> crazy.  So my question: Does anyone know if there's an ip route command to
> make the Bcast field show up as the correct value, or is there a better
> way for heartbeat to get the broadcast address?
> 
> (I'm just realizing now that I don't know how it gets the broadcast address.)

I have a packet of C code which is supposed to do much/all of what IPaddr 
does.  It might be nice to use that for some of these things...

	-- Alan Robertson
	   alanr@unix.sh

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