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Packet capture looking dhcp offer packets. 2. Configure dhcp snooping on your LAN switches. 3. So an ipconfig /all on the client (windows) PC to see the IP address of the dhcp server or received its address from. Sent from Cisco Technical Support Android App.
After adding a host to the switch I enter the console of the host. I enter "ip dhcp." Then it says it cannot reach the DHCP server. Then I turn off the router, switch and hosts. I turn then back on. I then go into every console of each host and type "ip dhcp" and it finds an IP address via DHCP. The problem occurs when I add hosts to the switch.
Enter that command ' show ip dhcp pool ' to see if there are any DHCP pools configured on the switch. If there are, it confirms that the switch is indeed serving DHCP requests. By a 'show run' command you will see also the DHCP server configuration. Best regards.
12-10-2008 07:19 AM. one more solution.Try continuous ping to the rogue ip from ur laptop that got the DHCP ip .log into the switch on which the laptop is connected. give show arp | in 192.x.x.x (rogue dhcp ip ). that will give u the mac address for the rogue device. get that mac and use " show mac-address-table address {mac address} " and try ...
The DHCP server is not on the same network are the gateway for vlan 254. You need to change the gateway address to the same network as the DHCP server or change the DHCP server ip to be on the same network as gateway e.g. interface Vlan254. ip address 172.16.0.112 255.255.255.0.
In response to B.dreuning. Options. 03-29-2022 04:15 AM. Hello, one of the 'quirks' in Packet Tracer and DHCP is that you explicitly have to exclude the IP address of the default gateway, if you don't, it will assign that address to the first device that requests an IP address.
However, that's the point. There is no such thing as "Internal DHCP Server" under Controller tab in GUI. I deployed vWLC three times and it've never showed up in GUI. If I go to HOME page (the first page after login page) and all the way down to the "best practice", then you can see the Internal DHCP server checked as DISABled.
So, to solve this you must exclude IPs of the routers and switches in that pool from DHCP Pool. Command is. ip dhcp excluded-address 10.140.4.2. ip dhcp excluded-address 10.140.3.129. You must add at least one exclude command per each DHCP POOL to exclude those addresses already used by routers/switches.
So, going by this ,wht u can do is, frm one of the affected pc's , try to find the mac of the rogue server by using arp -a command cos that server wld be responding to arp request while dishing out invalid pool ip's. then chk on the related router/switch to track the interface and subnet it resides on. This is the simplest way to track these ...
Some things to check: Check the 6513 configuration itself to see if the switch is indeed providing DHCP to the phones. Check the ip-helper addresses configured on the switch interfaces. These will point to the DHCP servers. If 1 & 2 don't show anything, then the DHCP serve may be on the specific VLAN.