The ramblings of a computer geek
After setting up AAA on all our switches (there’s loads of tutorials on the Internet about this) we had the problem that this also applied to the console port. We didn’t want the risk that a faulty switch could be rendered inaccessible by the AAA and leaving us in a panic about what to do … Read more
We had a severe lightning storm with power cuts and multiple lightbolts hitting our buildings and grounds around our core server rooms. Luckly the UPSes carried the load and gobbled up the overvoltages etc no problem. However the lightning induced an over voltage in the copper cables that run from the Cisco 6509 POE Blades … Read more
In this example the ghost server is on IP address 172.27.5.73/24 and is in vlan 205. The ghostcasting clients (i.e. a workstation I want to re-ghost) is in vlan 240 on IP address: 172.27.240.10. There are two DHCP servers also in vlan 205 on IP addresses 172.27.5.131 and 172.27.5.132. We want the ghostcast client in … Read more
Tried to connect up to a pix using a Cisco VPN Client, the connection connected fine, but when I tried to VNC or RDC to something had no joy. Checking the statistics of the vpn connection on my pc it showed sending traffic but not getting anything back. This is caused by a problem with … Read more
On our Cisco 4500 series switches we could not see when ports where going up or down, even when using “terminal monitor.” We use this technique to identify ports and has been useful in our VLAN project. The problem was that on 4500 series switches, you need to manually enable this type of logging, to … Read more
I had a cisco 3750 switch that i wanted to enable some vlans for voice on, but only having one DHCP server on a completely seperate vlan to the voice vlans. vlan 1 = data (dhcp server on this range) vlan 266 = voice (phone dhcp clients on this range) PROBLEM The switch for some … Read more
We were setting up an Aruba with a Cisco 3750 we are trying to allow trunking of VLANs to the aruba from the switch and also bonding both the NICs on the aruba to two ports on the cisco in an etherchannel to give us 2GB uplink. Here’s how we did it, we didn’t need … Read more