gurfin gurf1n

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1. ENCOR #9 - The big scary multicast

   I have a special appreciation for the multicast technology. Back when I used to work in first line support for a Swedish service provider of IPTV, I was always intrigued by the efficiency of using multicast to deliver the TV to peoples homes. Using multicast drastically reduced the bandwidth requirements for the central streaming sources that were used to send out the TV broadcasts onto the fiber networks. Now, in recent years service providers have moved away from this and into using unicast streaming in stead.

   ENCOR

2. bird2 command reference - from a Cisco users perspective

   A project I have recently undertaken requires me to use linux based routing processes to communicate with other peers. The software I have chosen to run is bird2, which allows me to establish adjacencies with and BGP peer, Cisco or other. I have noticed however, that I find myself google:ing the same commands over and over again. So I though I would collect all the commands I have found to be useful in a blog post, that I myself can refer back to.

   dn42

3. Migrating my blog to the cloud ☁️

   Is this the tech bro equivalent of dying your hair a different color? /s

   I have wanted to move away from the WordPress based solution that I used for blog.gurfin.se for some time now. Given that WordPress is prone to… inviting, uninvited, guests… I wanted to move to something that was more secure and lighter weight.

   Cloud CI/CD

4. MTU and PMTUD on L2VPNs

   I ran into an interesting issue at work today. One of our customers were having issues with a site in Gothenburg. They were using L2VPNs as circuits between their central site and the remote sites. Across this L2VPN they are running MPLS MP-eBGP peering using inter AS option 2b to allow multiplexing of different routing-instances on the WAN. We were observing BGP flapping between the secondary ASBR router on site and their central ASBR router.