Friday, 23 January 2015

Minimal SNMP View for Solarwinds Management of a Cisco Device

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Some time ago, I was asked to provide a customer read-only SNMP access to a router so that they could monitor bandwidth utilisation. Unfortu...

Adjusting timestamps in PCAP files

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Many times in the past I've had to look at a pair of pcap files side by side in order to troubleshoot an issue. More often than not, one...
Monday, 12 January 2015

Bending the MPLS Security Model - part 3 (Layer 2 Injection)

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Attack 1 - layer 2 injection Back in the days when I did solution validation and regression testing for a living, I normally had to s...
Thursday, 27 November 2014

Removing VLAN/MPLS/PPPoE/GRE/GTP/VXLAN Encapsulation Headers from pcap Files

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Many years ago, when I worked in a school, I used to port mirror our proxy server to an old PC running driftnet and leave the screen where t...
11 comments:
Friday, 21 November 2014

Troubleshooting PPPoE Client on Cisco Routers

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There are are essentially a handful of stages involved in bringing up a PPPoE client session on a Cisco router, each of which could fail for...
4 comments:
Thursday, 13 November 2014

Basic Internet Connectivity Setup Using HWIC-3G-GSM Card

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In addition to working on some spanking new 4G Cisco 819 devices, I've occasionally had to slum it by providing Internet access with a n...
1 comment:
Monday, 6 October 2014

Quiet Mode on ME3x00 Platforms

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The Cisco ME3x00 range of devices comes with automatic lockout for SSH as default. If too many bad login attempts are made within a short pe...