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Hi, I'm Iljitsch van Beijnum. This page has all posts about all subjects.

BGP - Building Reliable Networks with the Border Gateway Protocol

O'Reilly, Sebastopol, CA, 2002. ISBN 0-596-00254-8
Iljitsch van Beijnum
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Permalink - posted 2002-09-22

Mijn foto's van Megabit 2002

In de vroege jaren 2000 organiseerde BIT een aantal keer een openlucht-evenement in Edewaar mensen uit de Nederlandse ISP-business bij elkaar kwamen.

Permalink - posted 2002-08-23

Ownership of address space

In the first week of May, a message was posted on the NANOG list by someone who had a dispute with one of his ISPs. When it became obvious this dispute wasn't going to be resolved, the ISP wasn't content with no longer providing any service, but they also contacted the other ISP this network connected to, and asked them to stop routing the /22 out of their range the (ex-)customer was using. The second ISP complied and the customer network was cut off from the internet. (This all happened on a sunday afternoon, so it is likely there is more to the story than what was posted on the NANOG list.)

The surprising thing was that many people on the list didn't think this was a very unreasonable thing to do. It is generally accepted that a network using an ISP's address space should stop using these addresses when it no longer connects to that ISP, but in the cases I have been involved with there was always a reasonable time to renumber. Obviously depending on such a grace period is a very dangerous thing to do. You have been warned.

Permalink - posted 2002-06-30

Packet reordering

During the second week of April there was some discussion on reordering of packets on parallel links at Internet Exchanges. Equipment vendors try very hard to make sure this doesn't happen, but this has the risk that balancing traffic over parallel links doesn't work as good as it should. It is generally accepted that reordering leeds to inefficiency or even slowdowns in TCP implementations, but it seems unlikely reordering will happen much hosts are connected at the speed of the parallel links (ie, Gigabit Ethernet) or there is significant congestion.

Permalink - posted 2002-06-29

Telephony best practices for IP

In March, the NANOG list focussed some of its attention on efforts of the telephony world to com up with "best practices" about packet networks/the internet. (Network Reliability and Interoperability Council publications) In meeting minutes, 100% of the carriers reported to abide by these best practices, which include firewalling routers and DNS servers.

There were discussions about the merits of filtering/firewalling at OC-192 (10 Gbps) speeds (which, depending on your definition of "firewall" may be impossible to do) and about out-of-band versus in-band management. The former is always used in the telephony world, the latter often in IP. The main problem with out of band management is that the management network may be unavailable when the network is in critical need of being "managed". Also, many vendors do not support a clear separation between production and for-management interfaces.

Permalink - posted 2002-06-28

April fools day RFCs

► April fools day is coming up again! Don't let it catch you by surprise. Over the years, a number of RFCs have been published on April first, such as...

Full article / permalink - posted 2002-04-01

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