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LineVTY, Author at #LineVTY.com

Author Archive

Change the timezone in Cisco ACS 5.x

If you have mistakingly configured the wrong timezone in Cisco ACS during the build, and are concerned about changing the timezone in a production environment – you should be! I attempted this on ACS 5.8, only to spend a few hours restoring the server. My second attempt however, after conversing with TAC, went a lot

Configure DHCPv6 on an IOS Router for IPv6 Clients

This post explains the multiple options for addressing your IPv6 endpoints including SLAAC, DHCPv6 and DHCP relay to a Microsoft Windows Based DHCP Server For a simple deployment you might be used to using the router or switch as a local DHCP server, in v4 this was rather simple as per the example configuration below;

Cisco ASR1000 Packet Capture

Running packet capture on a router is, in my opinion, one of the best features Cisco provide. Most Cisco router platforms have the facility to run a packet capture on the box and here I demonstrate how to carry one out on any ASR1k platform such as the ASR1001, ASR1002, ASR1002x etc. First, we should

How to crack Cisco Type 5 (MD5) Passwords

Whilst Cisco’s type 7 passwords are incredibly easy to decrypt (iBeast is my goto tool), Type 5 passwords are currently not reversible… that does not however mean they are not susceptible to brute force attacks. Whilst its reasonably impractical to brute force a router’s login due to the amount of time it would take for

BGP – Active open failed – tcb is not available

So i had an issue with BGP where it wouldn’t establish a neighbor relationship.   I ran the usual ‘debug ip bgp’ but it only showed ‘connection timed out’ Here is a sample debug output of one of the neighbour setup attempts; 198.51.100.12 active went from Idle to Active 198.51.100.12 open active, local address 198.51.100.13

Automate your Cisco CCIE Home Lab for the INE Workbook v5

I recently gained access to an INE All Access Pass, which includes the Cisco CCIE Route and Switch v5 Workbook and various labs with a view to taking my lab exam. Whilst it included some rack rental tokens I have the resources to build my own lab and use it whenever i see fit, no

Reload in.. how about terminal revert?

Ok.. so learnt something new today.. (every days a school day!) Depending on your device and code, you should have the following command available to you… config terminal revert time x What this effectively does is save the running configuration to a backup file on the local flash and will revert to this config after

Cisco Router – Frame relay switch configuration (Point to Point)

This Post is for Point to Point, I will do a further post on Point to MultiPoint So, as part of my CCIE practice lab I’ve got a frame relay cloud for testing point to point and multipoint connections. Totally forgot how to do this (the phrase use it or loose it comes to mind!)

Cisco CLI shortcuts

So, another addition to a base config, you can save yourself some precious time with these nifty alias shortcuts… My favorites, are; SRI – pipes the ‘include’ statement to a show run, probably my favorite R1(config)#alias exec sri show run | include SHIP – really lazy command, but every second counts when troubleshooting problem R1(config)#alias

Cisco ASA, Email Alerts

This little used feature (at least in my experience) is actually quite useful and works with all ASA versions. The Cisco ASA 55xx Firewalls are actually able to send you an email based on *any* syslog’s that may be generated. This is very useful when you don’t run a syslog server, or just want some