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@hgn
hgn / tcpdump IPv6 router advertisement
Created March 16, 2015 18:59
Capture of IPv6 advertisement message via tcpdump
@virgo:~ $ sudo tcpdump -vvvv -ttt -i eth1 icmp6 and 'ip6[40] = 134'
00:00:00.000000 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 200) fe80::b675:eff:fefa:1cb > ip6-allnodes: [icmp6 sum ok] ICMP6, router advertisement, length 200
hop limit 0, Flags [managed, other stateful], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
source link-address option (1), length 8 (1): b4:75:0e:fa:01:cb
0x0000: b475 0efa 01cb
mtu option (5), length 8 (1): 1280
0x0000: 0000 0000 0500
prefix info option (3), length 32 (4): 2a01:ffff:43f::/64, Flags [onlink, auto], valid time 7200s, pref. time 1800s
0x0000: 40c0 0000 1c20 0000 0708 0000 0000 2a01
0x0010: ffff 043f 0000 0000 0000 0000 0000
@BigglesZX
BigglesZX / Dreamhost.Python.installation.textile
Created January 14, 2012 10:49
Installing a custom version of Python on Dreamhost

Dreamhost supplies a fairly old version of Python in their shared hosting environments. It recently became necessary for me to use a newer version, and since this involved a bit of juggling, and since I’m also likely to forget how I did it, I thought I’d detail the steps here. These instructions should work with any Dreamhost shared hosting user, but follow them at your own risk.

The end result of this process is being able to run a current version of Python from your shared hosting user’s shell. It requires compiling, installing and running Python from your home directory rather than the system bin directories.

1. Create a helpful working directory
I chose to install all Python-related stuff in a python/ directory under my user’s home directory.

$ mkdir ~/python
$ cd ~/python