I ran four tests yesterday using iperf3. The T6225-CR NIC still runs with Chelsio’s SM10G-SR optics. It’s amazing that receiving TCP streams runs at full speed. Sending TCP streams limps away only at a few megabits per second. This wasn’t expected at all. Even IPv6 runs faster than IPv4 for these particular tests. The Cisco […]

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Sometime ago I switched from a Huawei E220 to a Huawei B593s-22. My 3G internet connection became a 4G internet connection in an instant. I recently turned on IPv6 on the 4G WAN interface, only to be really disappointed. NetCom does not offer IPv6 service to its 4G customers. That’s a shame. With ARIN running […]

Read More → NetCom 4G and Huawei B593s-22

ARIN, the American Registry for Internet Numbers, is closing in on their Z day. Soon only AfriNIC will have IPv4 address blocks available for their customers, and even AfriNIC will run out of IPv4 addresses sometime in the year 2019. See ARIN’s IPv4 depletion webpage for more information. The bottom line is: Start using IPv6!

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I had a FreeBSD setup I wanted to replicate to another, identical computer. The source system runs ZFS and so should the receiving system. A recursive snapshot in combination with the zfs send and zfs receive commands proved most fruitful.

Read More → Replicating an entire FreeBSD system using ZFS

An acquaintant posted the following question on an IRC channel earlier today: How many IPv4 addresses are there? The quick and simple answer is 232 = 4,294,967,296 addresses. Is this an accurate answer? Yes, in a strict interpretation of the original question. A far more interesting puzzle is if you want to account for all the IPv4 […]

Read More → How many IPv4 addresses are there?