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Wrvs4400n vlans/ssid/dhcp issue

Hi all,

it will be great if someone will help me with my problem.

the problem is : our wrvs4400n  wifi router configuration.

network description: we need 2 separated wifi networks one for guests and one for internal access, and i configured them on router, and also configured each one of them to different vlan, guests to vlan 200 and internal use default vlan 1.

vlan 1 configured as dhcp relay and its working pritty well.

vlan 200 configured as dhcp and the problem begins here.

somehow  on vlan 200 i get dhcp from our externam dhcp server,

wrvs4400n conected  as follow> lan port1/vlan 200 connected to firewall port(configured as vlan 200) and lan port 4/vlan1 conected to our main switch wich connected to firewall also.

i guess that my knowlege in networking its not so good......

how can i prevent from our internal dhcp to comunicate with vlan 200 ,

any help will be very appreciated.

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