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Same VLAN on two switches (S3300's) will not communicate
Hi, probably its just a stupidity issue on my side but I can't get this to work. I am trying to get two boxes to communicate over two switches using a particular vlan. This is actually the simplifi...
That's correct. Functionality of VLANs is to separate the actual/physical networks. VLANs also have a default gateway even if it is set to static and even if they are working on the same subnet. You should have a default gateway(router) configured if not the traffic will not route across the network. Have you tried the setup that I suggested? That is also how VLAN works even if you use different switches. Every network has its own default gateway even if we are not talking about VLANs.
Regards,
Hi,
the separation into VLANs additionally to subnets was to separate the actual networks physically to prevent broadcast/multicast messages from impacting the other services. Additionally I need those to separate two DHCP servers running in my network (one internal, one DMZ).
My Vlan1 currently spans a /22 net, my other VLANs are on 12 /24 nets for various activities
My primary DHCP (Sophos FW VM) resides on VLAN 1 running at the other switch I can't reach.
Is your idea now to add 12 additional interfaces (one for each vlan) to that vm so that each of them has a default GW it could get assigned?
Still don't understand why - what is the purpose of the default GW if all IPs are in the same vlan - I thought a trunked vlan kind of extendes the L2 network to the other switch so ll hosts are in the same domain ... might be wrong o/c but have not found a good explanation anywhere...
Thanks
That's correct. Functionality of VLANs is to separate the actual/physical networks. VLANs also have a default gateway even if it is set to static and even if they are working on the same subnet. You should have a default gateway(router) configured if not the traffic will not route across the network. Have you tried the setup that I suggested? That is also how VLAN works even if you use different switches. Every network has its own default gateway even if we are not talking about VLANs.
Regards,
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