Re: [bitfolk] Network settings change needed for most UK customers

Hi, BitFolk's IP assignment has grown from 212.13.194.0/24 (i.e. 212.13.194.0 -> 212.13.194.255) to 212.13.194.0/23 (i.e. 212.13.194.0 -> 212.13.195.255). This means that almost all customers in the UK need to change their netmask. This is largely harmless since all it means is that you cannot communicate with IPs in 212.13.195.x, and for some time to come that will only be other customers. However, eventually I will need to start putting infrastructure into there too. Here are some instructions on how to change the settings. You should be able to do this without losing any network connectivity. These instructions are for Debian/Ubuntu, so Centos and Gentoo folks you are on your own unfortunately, but this isn't complicated -- I believe the only Debian-specific bit is step 4. 1. Make sure you have access to your Xen shell console in case anything goes wrong. 2. MAKE SURE YOU HAVE ACCESS TO YOUR XEN CONSOLE IN CASE ANYTHING GOES WRONG. REALLY. LOG IN AND CHECK. 3. Check that you actually need to do this. An example of a VPS that needs to make a change: $ /sbin/ip ro 212.13.194.0/24 dev eth0 proto kernel scope link src 212.13.194.75 default via 212.13.194.1 dev eth0 Note the /24 -- it should be /23. 4. Fix your config file, /etc/network/interfaces. Here's an example of the content before it is fixed: ----[ /etc/network/interfaces ]-------------------------------------- auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 212.13.194.75 netmask 255.255.255.0 gateway 212.13.194.1 ----[ /etc/network/interfaces ]-------------------------------------- Here's an example after fixing: ----[ /etc/network/interfaces ]-------------------------------------- auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 212.13.194.75 netmask 255.255.254.0 gateway 212.13.194.1 ----[ /etc/network/interfaces ]-------------------------------------- The only line changed is the netmask. You should change this config file ready for the next boot, but it won't alter your current settings. 5. Find your current IP address: $ /sbin/ip -4 addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue inet 127.0.0.1/8 scope host lo 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 inet 212.13.194.75/24 scope global eth0 In this example my IP address is 212.13.194.75. 6. Add it with the correct settings: $ /sbin/ip addr add 212.13.194.75/23 dev eth0 That should complete without error. 7. Remove the old one: $ /sbin/ip addr del 212.13.194.75/24 dev eth0 That should complete without error. 8. Check that your routing table is now correct: $ /sbin/ip ro 212.13.194.0/23 dev eth0 proto kernel scope link src 212.13.194.75 default via 212.13.194.1 dev eth0 That's it. You should not lose connectivity at any point during this procedure. If you're already using the /23 setup (anyone set up probably in the last 2 weeks, but do check) then you don't need to do anything. If you have your own net block routed to you then you don't need to do anything. If you have multiple IPs then your interfaces file might look a bit like this: ----[ /etc/network/interfaces ]-------------------------------------- auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 212.13.194.75 netmask 255.255.255.0 gateway 212.13.194.1 auto eth0:1 iface eth0:1 inet static address 212.13.194.116 netmask 255.255.255.255 ----[ /etc/network/interfaces ]-------------------------------------- The netmask of aliased IPs (eth0:1, eth0:2, ...) does not need to change. IP aliases on the same network as another interface are supposed to be 255.255.255.255 netmask. So in this case you would only need to be fixing the netmask for the eth0 entry, and adding/deleting 212.13.194.75. If you have any questions please feel free to mail me on or offlist about it before you do anything. If Centos/Gentoo folks could contribute a HOWTO for this then that would be great. Cheers, Andy ------------------------------------------------------------------------ _______________________________________________ users mailing list users(a)lists.bitfolk.com https://lists.bitfolk.com/mailman/listinfo/users