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Upgrading the Options (GlobeTrotter) GI515m
Recently I needed to install an Options (GlobeTrotter) GI515m 3G USB modem on a machine which previously used an older version of the modem (the iCON 225). This seems a pretty common scenario (an existing user getting an update), however the process seems less-than-straight forward: Get a second computer with the same operating system version…
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Creating a non-MAC bound CentOS 6 machine
I was building VMs to be deployed with Vagrant / Virtualbox for our QAs and discovered that on new instantiations of the machine the networking interface wasn’t coming up. The problem was that Virtualbox was assigning a random MAC address to the NIC (and rightly so, to avoid conflicts). I used the following steps to…
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Manually enabling IP routing in Windows XP
While Internet Connection Sharing is a nifty tool, there are some cases where you would like to do the steps manually. One such case would be if the “primary” network is already using the 192.168.0.1/24 address space, since ICS is hardcoded (as far as I can tell) to use the same network. One concrete case…
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Why you should use 0.0.0.0 in your hosts file – redux
Some time ago I (wow, time files!) I suggested that using 0.0.0.0 for host-file based blocklists would be faster than using 127.0.0.1. Above you can see an other reason for using 0.0.0.0: some applications take up port 80 on the localhost and accessing it can (potentially) create havoc. In the example above TeamViewer (which is…
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Remote debugging with Java
Sometimes you have the situation that an issue is only occurring on certain machines or only at a certain time of day. There are a couple of possible methods to investigate such an issue (like: adding extra logging), however I would like to add an other one: remote debugging trough TCP/IP. To do this, start…
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Parsing pcap files with Perl
Recently I was reading the blogpost on the BrekingPoint labs log about parsing pcap files with Perl and I immediately said to myself: it is impossible that there isn’t a module on CPAN, because Perl is great. Turns out I was right, there is Net::TcpDumpLog which can be combined with the NetPacket family of modules…
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Why network neutrality is a big deal
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Network Forensics Contest submission
Some time ago I mentioned the Network Forensics Puzzle. The contest is now over and since I didn’t win, I’ll publish my submission below – it was after all correct, but not quite what the judges were looking for (congratulation to the winner). After validating that the MD5 sum for the downloaded file matches the…
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T2’09 Challenge
Sorry for being a little late: the T2’09 challenge just started. Via the F-Secure weblog. Don’t be fooled by the fact that page already contains two entries (“Mr. Speed” and “Mr. Style”) in the top. From what I understand, these are to signal that two winners will be selected, one for speed and one for…
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If you can’t access Windows shares…
A small Windows tip: if your computer is part of a domain and all of the sudden you can’t access resources over the network (like shares, printers, etc), try changing your password. I observed this in several networks, and although I’m not entirely sure about the reason – I suspect that it has something to…