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Apple screen sharing different vlans

Posted on 2011-02-28
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Last Modified: 2012-05-11
The network I'm working on was once one big VLAN - everyone was on the same broadcast domain.
This included an apple lab that had several mac mini systems setup with Screen Sharing active.

Once the network was VLAN'd (separating the main user community from the lab system) - Screen Sharing to these lab Macs became unavailable.

A mac user needing access to the lab mac could still VNC in (i.e. VNC://labmac) but could no longer get to the Mac via Screen Sharing from the Finder.

I understand that Apple Remote Desktop will not work across VLANs but is Screen Sharing affected in a similar manner or is there some modification within the VLAN or lab ports these Macs are connected to in order to reactivate Screen Sharing?

The network is connected to a Cisco 4510 switch - Layer3 - which handles the VLANs/routing

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Question by:techjunky
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by:nappy_d
ID: 35003483
You will need a router to handle traffic between your VLANs. Without this, you will not be able to see traffic on the other VLANs.
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by:Aaron Tomosky
ID: 35003885
Last I checked apple stuff used bonjour which uses mdns multicast dns. I have a sonicwall that does some magic across subdomains so that multicast looks like it comes from that subdomain instead of the original one. This is how I got it to work. I don't know if cisco has something like this or what it's called.
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by:Aaron Tomosky
ID: 35003896
In the sonicwall it's called "ip helper" and only the enhanced os has it.  If that helps.
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by:techjunky
ID: 35010952
It's not a matter on not seeing across the VLANs - this Layer3 Cisco switch does a perfect job of routing/switching without requiring an additional router in the max.

The VLANs can exchange data amongst each other without a problem - this is true for the PCs in the lab as well as the Macs - it's only this specific part of the Mac - screen sharing - which seems to not be able to cross the VLAN

I currently run the IP Helpers on my VLANs for distributing DHCP addresses via multiple scopes (based on vlan) from one server - but I don't see where they would help in this specific situation.

I may be limited to placing those lab macs back on the same VLAN the production environment is on.
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by:nappy_d
ID: 35016399
OK, so you believe that inter vLAN routing is working. What subnet is the between the two vLANs? Are they the same?
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techjunky earned 0 total points
ID: 35021549
Different subs.


Lab is on /24

Production is on /21

Curious - I should change the lab to the /21 sub - remaining on its current vlan
Will give that a shot shortly
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by:nappy_d
ID: 35022626
Yep, that should be your fix.  
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by:Aaron Tomosky
ID: 35022900
Im no expert on vlans, just learning really.  I thought vlans had to be on different subnets?
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by:nappy_d
ID: 35023192
No, you can have many subnets on the same LAN. The computers will only broadcast to others on the same subnet.
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by:techjunky
ID: 35223107
Point awarded (a little late) to nappy_d

Please close this questions successfully.
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by:Qlemo
ID: 35275247
This question has been classified as abandoned and is being closed as part of the Cleanup Program. See my comment at the end of the question for more details.
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