Leaking/Bleeding VLANs

[SebD]

Hi All,

 

I was wondering if anyone has experienced anything similar and can give me a few pointers.

We are currently experiencing bleeding between some of our VLANs (Specifically traffic from one of our WLAN on Meru is bleeding onto our curriculum VLAN)

This is causing an intermittent connection to our smoothie box/gateway.

 

I 'm looking down the route of ARP tables and ARP flux but I don't feel like i'm making progress (Not very knowledgeable about this area)

 

Our switches are currently a mix of managed layer 3 HP and some very old 3com switches which I really want to bin completely but y'know... Money

 

Cheers guys

S

[SebD]

After furthur investigation, i've found its not to do with the above.

We want our smoothwall to be able to have the same fqdn on different subnets and our wireless devices are pinging the wrong IP for their proxy/gateway.

Adding a reverse lookup zone fixed this for our wireless devices, but messed up our LAN. It would round robin between the two different IPs

 

Could anyone point me in the right direction? Is this a DNS or routing issue?

[emdrum]

Hi SebD,

 

This sounds like a routing issue to me, though I would need a better understanding of your topology to be able to diagnose the issue better.

 

It sounds like you should be routing the different subnets to some sort of core switch and then directing that through your Smoothwall as default gateway from there, rather than using DNS to give different IPs for the Smoothwall on different subnets. I may have misunderstood, so forgive me if I'm not addressing the issue properly.

[SebD]

Thanks for the help emdrum.

Feel a bit silly now as it was a really easy fix of sorting out WPAD to work properly.

 

Thanks anyway.