One of my client is using VTP domain in switched n/w.DHCP and Vlan ip range is configured in the firewall.I dont have the access on the firewall.In this case is there any option for me to find the Vlan ip range?
Why not to ask the person operating the firewall? There should be no security issue in giving this information.
Besides: the network mask received by DHCP gives you an upper limit. There might, however, be reserved IP ranges not available through DHCP.
Another approach would be to use denial-of-service tools flooding the firewall with DHCP requests. Security people will not appreciate this at all and I recommend not ever to use this in a production environment. (should only be used for security audits and in test environment).
So the simplest approach will be to ask the firewall admins.
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