Cisco Router – Configure NAT (NAT Overload)
NAT Overload KB ID 0000971 Problem NAT is the process of taking one or more IP addresses and translating it/them into different IP addresses. You may require your router to translate all your internal IP addresses to your public (ISP allocated) IP address. To do that we use a process called NAT Overload. Solution : Nat Overload 1. Connect to the router, and got to enable mode, then global configuration mode. PetesRouter#configure...
Cisco ASA Remote Management via VPN
ASA Remote Management KB ID 0000984 Problem It’s been ages since I has to do this, I usually just manage firewalls via SSH from outside. But I was out on a client site last week and needed to connect to to my ASA, so I simply connected in via AnyConnect; Note: The same procedure is applicable if you are an IPSEC VPN client, L2TP VPN client, or simply coming in over a site to site VPN link. And attempted to SSH, no joy, I tried...
ENE-NG and GNS3 – Speed and Duplex Mismatch
Duplex Mismatch KB ID 0000983 Problem I don’t know why this happens sometimes with GNS3, and EVE-NG but occasionally I will get a connection between two devices that constantly complains. %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on {interface-name} (not half duplex), with {host-name} {interface-name} (half duplex). For the uninitiated, a speed/duplex mismatch, usually happens when both ends of the link are set...
Cisco ASA: Prioritise RDP Traffic
KB ID 0001359 Problem I have a client who had two sites, one didn’t have a particularly good internet connection, (which is the actual problem that needed to be solved). But in the interim, he wanted me to prioritise RDP traffic, as his staff were constantly complaining about the speed of their connections. Note: They may be a myriad of reasons why user experience is bad for an RDP session, this was quite simply a bandwidth...
Cisco IOS – How To Find VLAN IPs (SVI’s)
KB ID 0001258 Problem If you have a complicated network, you can spend more time finding out how it’s configured, than actually doing any work on it! Today I had a client that needed some changes made on their LAN, I knew their name, and their network address, and common sense told me which of the core switches they were connected to. Solution A quick search on the client name told me what VRF they were in, and what VLAN they...