Category Archives: Wireshark

GNS3 WorkBench v8.6 is finally out

Executive Overview The next version of GNS3 WorkBench is out.  You can download it several forms: An entire Virtual Machine as a single blob (although split into two files 2.5G-3G in size) The same Virtual Machine as individual files (in case … Continue reading

Posted in CCNA, Certifications, Cisco, dynamips, GNS3, GNS3 WorkBench, ICND1, ICND2, Labs, Mac OS X, Microsoft, Routing, Wireshark | Tagged , | 7 Comments

Is GNS3 going commercial? Surely Not!

I was firstly delighted, then dismayed by an email that appeared in my inbox this morning. It read: Hey GNS3, We are completely rebuilding GNS3 and want your help! In 2013, we are going to be building a brand new … Continue reading

Posted in CCNA, Cisco, GNS3, Labs, opinion, rant, Wireshark | Tagged , , , , , , , | 8 Comments

Application Gems

Everyone has their favourite applications, and every now and then you find a gem that you wonder how you ever lived without. Here are my “gems”, I hope you find some of them as useful as I have. Some of … Continue reading

Posted in Mac OS X, Macintosh, Microsoft, Microsoft Word, opinion, SSID, VMware, wifi, Wireshark | 18 Comments

Making “monitor session” work on Cisco 3750 switch

It may just be the version of IOS my customer is using, but today I came across a bug when trying to capture traffic on a Cisco Catalyst 3750 switch. The most frustrating part is that I’d seen this before, … Continue reading

Posted in Cisco, IEEE, mst, portfast, rapid spanning-tree, rapid spanning-tree, session monitor, spanning-tree, spanning-tree, Wireshark

decoding vlan.dat

I was trying to find out where vtp transparent switches stored the vtp information that they pass on to other switches (I’m now of the opinion that they don’t – I think they simply read vtp frames, check them for … Continue reading

Posted in Cisco, perl, Wireshark | Tagged , , , , ,

Broadcom NIC won’t capture in promiscuous mode

I had a bunch of Windows XP PCs with Broadcom NetXtreme Gigabit Ethernet Adapters that refused to capture (in Wireshark) traffic that had been directed to it using a monitor session command (on a Cisco switch). It would see broadcast … Continue reading

Posted in Wireshark | Tagged , , , , , , , ,