Category Archives: Cisco

EIGRP Authentication on Frame Relay (just for recreation!)

As part of my ongoing studies I’ve been looking at running EIGRP over a hybrid Frame-Relay network. This is mainly an exercise in switching off split horizon – and a very long winded way of getting there. Whilst doing the … Continue reading

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Nagios jitter testing

As part of our new SLA we are required to test and repost on jitter across the core of our network on a per MPLS VPN basis. That seemed ok to start with, but a Nagios does not have an … Continue reading

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IPv6 Tunnel using BGP on a Cisco 877

The last post was about basic IPv6 tunnelling using GRE and a static route from the ISP router to the Cisco 887 at the remote site. That all worked , but lacked ‘interest’. I had considered putting in a Cisco … Continue reading

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Basic IPv6 tunnelling using GRE using Cisco 887 va

While I was testing and setting up IPv6 enabled 30:30 servers, I needed to get IPv6 to my home. I thought I’d do a quick and dirty IPv6 tunnel from one of our transit routers (BGP Border router) to my … Continue reading

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Mixing IPv4 and IPv6 on Cisco Zone Based Firewall

My first attempt at this was not a great success as i was using a router on version 12.4.x which did not support the ZBF using IPv6 – nice to know! Moving on to IOS version 15.x, all seems to … Continue reading

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Cisco ASA connection limiting per client

One of our long standing server hosting customers was having an issue with his server whereby his server was being locked up by the Apache process being overloaded. The attacker was simply connecting to the server and then not issuing … Continue reading

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FreeBSD and RIP – solving MPLS VPN routing issue

Working on a network consultancy project with a customer to monitor remote sites in a part MPLS VPN/ part IPSec VPN was presenting problems for the Nagios server in our data centre. ¬†below is a basic overview of the network. … Continue reading

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Cisco VTI based VPN configuration on 887 router

The latest network consultancy job we are doing here at Gconnect involves a network designed to provide redundant VPN tunnels between 2 sites using a combination of 5 DSL (cisco 887) routers. The requirements for the job were that in … Continue reading

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Cisco ASA clearing individual remote sessions

Today’s ‘tricky’ support call was about a remote user using a Cisco ASA to connect to their head office using the Microsoft IPSec over L2TP method from the built in Microsoft VPN client. Putting aside the ‘noise’ on this call … Continue reading

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% Create the peer-group first – Cisco BGP issue

Today a customer asked me to add a peer via the Lonap peering LAN to their border routers. Normally a trivial operation as we, like everybody else use a peer-group arrangement, but on this occasion it would not accept the … Continue reading

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