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Tue Sep 28 19:41:03 2010 GMT: VMWare Server to KVM Migration
Sat Sep 25 22:11:39 2010 GMT: Faust @ The ENO
Mon Sep 20 19:19:54 2010 GMT: Bizarre MTU Issue
Just noticed a very bizarre MTU issue with my mobile broadband connection - it appears that just certain packets (if the length is >= 1465 and <= 1469) get dropped.
The ppp session negotiates a MTU of 1400 which is fine, but if you want to route some other traffic (with a MTU of 1500) over that interface you would expect path MTU discovery to sort out the MTU issue. But as MTUs of 1500 actually work, it initially appears to work quite fine (using a TCP MSS of 1460) until a packet with a length between 1465 and 1469 gets sent. As these packets get dropped the connection then just hangs.
The following output of "ping -q -c 2 -s $DLEN -M do" illustrates the packet loss issue with varying packet lengths ($DLEN):
PING 188.28.191.51 (188.28.191.51) 1435(1463) bytes of data. 2 packets transmitted, 2 received, 0% packet loss, time 1007ms PING 188.28.191.51 (188.28.191.51) 1436(1464) bytes of data. 2 packets transmitted, 2 received, 0% packet loss, time 1007ms PING 188.28.191.51 (188.28.191.51) 1437(1465) bytes of data. 2 packets transmitted, 0 received, 100% packet loss, time 1012ms PING 188.28.191.51 (188.28.191.51) 1438(1466) bytes of data. 2 packets transmitted, 0 received, 100% packet loss, time 1014ms PING 188.28.191.51 (188.28.191.51) 1439(1467) bytes of data. 2 packets transmitted, 0 received, 100% packet loss, time 1014ms PING 188.28.191.51 (188.28.191.51) 1440(1468) bytes of data. 2 packets transmitted, 0 received, 100% packet loss, time 1014ms PING 188.28.191.51 (188.28.191.51) 1441(1469) bytes of data. 2 packets transmitted, 0 received, 100% packet loss, time 1014ms PING 188.28.191.51 (188.28.191.51) 1442(1470) bytes of data. 2 packets transmitted, 2 received, 0% packet loss, time 1006ms PING 188.28.191.51 (188.28.191.51) 1443(1471) bytes of data. 2 packets transmitted, 2 received, 0% packet loss, time 1002ms PING 188.28.191.51 (188.28.191.51) 1444(1472) bytes of data. 2 packets transmitted, 2 received, 0% packet loss, time 1004ms
Sun Sep 19 12:21:20 2010 GMT: OpenIndiana
Just tried the initial OpenIndiana build in a KVM virtual machine. While the installation itself didn't work with KVM (had to use plain QEMU for that), it runs fine now (with KVM), although I had to restrict it to a single CPU (and it appears only the rtl8139 network adapter works properly).
Thu Sep 16 19:54:55 2010 GMT: London Sightseeing
Just added some pictures (and some more) from last weekend's sightseeing tour to Greenwich/Thames Barriers.
Sun Sep 05 09:03:38 2010 GMT: Notting Hill Carnival 2010
I have added a few pictures from the Notting Hill Carnival on Monday last week.
Sat Aug 28 12:58:51 2010 GMT: JabRSS Updates
I have just updated the JabRSS service to use a new feed parser. This is now based on the ElementTree API and is also ready for Python 3. One additional change is that JabRSS now also tries to strip off HTML tags in the summaries which should make it much more readable.
Wed Aug 25 18:21:06 2010 GMT: IPv6 T-Shirt
Sat Aug 14 09:02:23 2010 GMT: SQLite Write-Ahead Logging
Sun Aug 08 19:19:47 2010 GMT: iPhone 4 Death Grip
Sun Aug 01 19:26:49 2010 GMT: Carnaval del Pueblo 2010
Sat Jul 31 13:01:24 2010 GMT: HE.NET IPv6 Certified: Sage
