VLAN Question

[Steven Williams <Steven.Williams () computershare com au>]

Hi all,

I'm after some opinions of yours and your companies policy regarding the use
of VLAN's as a method of isolating the internet to internal VLAN's on the
same physical layer 2 / 3 switch and access controlled by ACL's or
firewalls. 

Would you or your company allow this, relying on permanant FDB entries,
disabled MAC learning ability, Layer 2 VLAN only, no routing or IP
forwarding enabled or purely stick with a physical isolation of a separate
switch etc. 

I've been told that Extreme switches implement VLAN's in hardware ASICs and
are not vulnerable to the compromises and denial of service attacks that
other vendors may be due to VLANs implemented in software.

It's clearly indicated by numerous sources including SAN's and some
penetration testing outfits that VLAN's can be compromised. 

Any feedback would be greatly appreciated....

Steve

Steve Williams 
Communications Support Engineer
Computershare Technology Services
Melbourne Australia
steven.williams () computershare com au
+61 3 9235 5651

www.computershare.com
 
 


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