Check this doc out for the "best pactices" of securing VLAN's

www.cisco.com/warp/public/cc/pd/si/casi/ca6000/prodlit/vlnwp_wp.pdf

That may help prevent vlan hopping form the DMZ

On 2/1/07, JT Moree <moreejt@pcxperience.com> wrote:
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> JT Moree wrote:
> > Does anyone know enough about VLANs on a Cisco Catalyst 4506 switch to explain
> > the security implications of this setup:
>
> More info to throw around and some answers to half posed questions . . .
>
> No money is allocated to do anything new (except maybe gigabit NICS in a
> few servers).  We want to maximize use of the equipment that we have.
>
> We have multiple 100M switches but one is failing.  Since we can't keep
> using it and none of the other switches are gigabit (to my knowledge) we
> want to use the CISCO gigabit switch for as many servers as possible.
> Right now the backup servers are using it to sync with each other.
>
> The thing is huge.  It's got 3 banks of 32 ports.  We've got 17+ dmz
> servers and a handful of internal servers.
>
> The DNS and web servers are in the DMZ so yes the internal network needs
> to get to them.
>
> The backup servers also need to get to them.
>
> There is a cisco firewall somewhere connecting the networks and the 'net.
>
> it seems the popular consensus is
>   don't use VLANS that talk to each other if it can be avoided.
>
> - --
> JT Morée
> PC Xperience, Inc.
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