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...
Enable PPTP Split Tunneling
PPTP Split Tunneling KB ID 0000997 Problem I was asked yesterday, “When you get five minutes, I need you to enable PPTP split tunneling, because when I VPN into a network I lose Internet connectivity”. On inspection he was using the Microsoft VPN client, I jumped on the VPN device to discover it was a Cisco IOS router. What I discovered was, unlike the firewall VPN’s I’m used to, you DONT set split...
Cisco IOS – Enabling LLDP
KB ID 0001289 Problem If you’re running Cisco IOS on all you devices then you can use CDP to see what’s directly connected, (unless you are on a Cisco firewall, but I did say IOS devices). Petes-Switch#show cdp neighbors Capability Codes: R – Router, T – Trans Bridge, B – Source Route Bridge S – Switch, H – Host, I – IGMP, r – Repeater, P – Phone, D – Remote, C...
Microsoft Azure To Cisco ISR Router Site to Site VPN
KB ID 0001220 Problem Last week I was having problems getting a VPN up from a client’s Cisco ASA into Azure. This was because the Azure estate was using ‘route-based’ or a ‘dynamic routing VPN’. See the following article; Azure to Cisco VPN – ‘Failed to allocate PSH from platform’ So the firewall was a non-starter, but Cisco ISR routers are supported, and they can handle virtual tunnel interfaces...
GNS3 – Error ‘ghostsize is to small for device’
KB ID 0000935 Problem While doing a quick lab in GNS3, I tried to add NAT to a router, and it fell over with the following error; R3(config-if)#ip nat outside % NBAR ERROR: parsing stopped % NBAR Error : Activation failed due to insufficient dynamic memory % NBAR Error: Stile could not add protocol node %NAT: Error activating CNBAR on the interface FastEthernet0/0 R3(config-if)# *Mar 1 00:01:11.655: %SYS-2-MALLOCFAIL: Memory...