Cisco – Joining Layer 2 Networks Over Layer 3 Networks
May22

Cisco – Joining Layer 2 Networks Over Layer 3 Networks

KB ID 0001313 Dtd 22/05/17 Problem It's a common problem, you want to connect one site to another and still have them on the same layer 2 network. As you can see above both the routers at the bottom are in the 172.16.1.0/24 network, let's assume they are clients in the same layer 2 network how would you connect them? Solution Option 1: xconnect over L2TP All the 'heavy lifting' is done on the SiteA and SiteB routers. We will start...

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Testing AnyConnect With Packet Tracer
Apr05

Testing AnyConnect With Packet Tracer

KB ID 0001298 Dtd 05/04/17 Problem Packet tracer is a great tool, I wrote about it in the 'Prove It's Not the Firewall' article a while ago. A couple of months ago I was having a discussion with a colleague about packet tracing a remote VPN client to check connectivity, he said at the time, "It will behave differently if the IP you use is already connected". I never really thought about it until today, when I was troubleshooting a...

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Cisco IOS – Enabling LLDP
Mar08

Cisco IOS – Enabling LLDP

KB ID 0001289 Dtd 08/03/17 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 - CVTA, M - Two-port Mac Relay Device ID Local Intrfce...

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Cisco FirePOWER is Blocking an Application
Feb27

Cisco FirePOWER is Blocking an Application

KB ID 0001286 Dtd 27/02/17 Problem A few weeks ago I installed a 5525-X firewall for a client, and set it up as follows; ASA Setup FirePOWER Services (for ASDM) And all was well, then a week later I got an email… One of our teachers is doing a project with MATHS and ICT involving bitcoin. Basically, he has something called BITCOIN CORE WALLET installed and it used to work with the old Firewall. I’ve installed it on my work...

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AnyConnect – “Connection attempt has failed due to server communication errors’
Jan31

AnyConnect – “Connection attempt has failed due to server communication errors’

KB ID 0001279 Dtd 31/01/17 Problem We had a firewall fail at work this week, as part of the rebuild the latest OS was put on it, version 9.7(1). I thought no more about it until I tried to VPN in and got this; I used my Windows 10 VM and that connected fine, only my MacBook could not connect, this VPN tunnel is a big deal I need it to get onto client's networks. I tried my other VPN connections and every one was fine, only the...

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Cisco AnyConnect – Allow Domain Password Change via LDAP
Jan14

Cisco AnyConnect – Allow Domain Password Change via LDAP

KB ID 0001273 Dtd 14/01/17 Problem   If you have remote users who connect via VPN, and a policy that forces them to change their password periodically, this can result in them getting locked out without the ability to change their password (externally). If your Cisco ASA is using LDAP to authenticate your users, then you can use your remote AnyConnect VPN solution to let them reset their passwords remotely. Solution Standard LDAP runs...

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