Scapy and IP Options
Create packets with custom IPv4 IP Option fields using Scapy:
>>> packet=IP(src="203.0.113.1",dst="203.0.113.2",options=[IPOption('%s%s'%('\x86\x28','a'*38))])
>>> ls(packet)
version : BitField = 4 (4)
ihl : BitField = None (None)
tos : XByteField = 0 (0)
len : ShortField = None (None)
id : ShortField = 1 (1)
flags : FlagsField = 0 (0)
frag : BitField = 0 (0)
ttl : ByteField = 64 (64)
proto : ByteEnumField = 0 (0)
chksum : XShortField = None (None)
src : Emph = '203.0.113.1' (None)
dst : Emph = '203.0.113.2' ('127.0.0.1')
options : PacketListField = [<IPOption copy_flag=1L optclass=control option=commercial_security length=40 value='aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' |>] ([])
>>> sr1(packet)
The above code results in the following packet (as seen by Wireshark):
Upgrade to Debian 8 without systemd
To avoid the automatic installation/switch to systemd during the upgrade to Debian 8, it is enough to prevent the installation of the systemd-sysv package.
This can be done by creating a file /etc/apt/preferences.d/no-systemd-sysv with the following content:
Package: systemd-sysv Pin: release o=Debian Pin-Priority: -1
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Obey the cloud!
So true...
"Obey the cloud!" by Johannes Kretzschmar, licensed under CC BY-NC-SA 3.0.
The Day Is My Enemy
Looking forward to see the live performance at the Future Music Festival 2015 :-)
Hand-crafted IP packets
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Christmas Run
Run #9 around Centennial Park. Two rounds again, this time during noon with some nice sun and a whopping 30°C :-)
Advent Run #8
Run #8 around Centennial Park. Two rounds again, and with some rain :-(
Advent Run #7
Run #7 around Centennial Park. Only one round, but the fastest one so far.
Advent Run #6
Run #6 around Centennial Park. Two rounds this time, with a slower pace though.