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08-06-2008 12:05 AM
08-06-2008 12:05 AM
5406 VLAN problem
I’ve just installed a 5406 to replace an Allied telesyn, I’ve recreated the VLAN structure as on the previous switch. Everything works well – DHCP/file/print/email/databases, except the staff who use outlook to access their webmail cannot connect. It appears to block the DNS request for an external domain.
The switch is the default gateway for the domain, our ISA server is the default gateway for the switch. When I try and resolve the address on the DNS server, it fails, but when I put the default gateway to the ISA it resolves it immediately, but the DNS server cannot be accessed by the rest of the network until I reset the default gateway,
What am I missing?
Any help would be much appreciated,
Thanks,
Ian.
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08-06-2008 01:12 AM
08-06-2008 01:12 AM
Re: 5406 VLAN problem
please send me show tech print
and send me dhcp and dns server ip address and isa server lan ip address
cenk
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08-06-2008 01:24 AM
08-06-2008 01:24 AM
Re: 5406 VLAN problem
- On the DHCP scope, what are the DNS servers configured ?
- Can the Client ping those servers ?
- You said when the ISA is the default gateway, it works, then:
I suspect its either a Routing entry missing on the ISA
Or
A security policy on the ISA should bve configured to allow clients with default gateway (switch) to access outside world or the DNS servers.
Good Luck !!!
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08-06-2008 02:59 AM
08-06-2008 02:59 AM
Re: 5406 VLAN problem
Thanks,
Ian
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08-07-2008 06:53 AM
08-07-2008 06:53 AM
Re: 5406 VLAN problem
and please say me pc ip address ,subnet mask ,default gateway and dns address
cenk
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08-07-2008 07:18 AM
08-07-2008 07:18 AM
Re: 5406 VLAN problem
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08-07-2008 10:47 PM
08-07-2008 10:47 PM
Re: 5406 VLAN problem
yes I think you can write static route on switch to isa server
0.0.0.0 0.0.0.0 172.16.0.2
and you can write static route isa server to switch
172.16.0.0 255.255.255.0 172.16.0.1
172.16.5.0 255.255.255.0 172.16.0.1
172.16.7.0 255.255.255.0 172.16.0.1
172.16.8.0 255.255.255.0 172.16.0.1
172.16.9.0 255.255.255.0 172.16.0.1
172.16.10.0 255.255.255.0 172.16.0.1
172.16.11.0 255.255.255.0 172.16.0.1
172.16.12.0 255.255.255.0 172.16.0.1
172.16.13.0 255.255.255.0 172.16.0.1
172.16.14.0 255.255.255.0 172.16.0.1
172.16.15.0 255.255.255.0 172.16.0.1
172.16.16.0 255.255.255.0 172.16.0.1
you make create each vlan one dhcp scobe
for example
for vlan 7 dhcp scobe
ip range 172.16.7.10-----200
subnet mask :255.255.255.0
defaut gateway 172.16.7.1
for vlan 8 dhcp scobe
ip range 172.16.8.10----200
subnet mask 255.255.255.0
default gateway 172.16.8.1
cenk