# Assigning tons of /64s to *nix machines (telehouse-NY) ### Get a /125 transit net for the connection to the server: `2620:57:e000:e::10/125` ### give the first IP in transit subnet to the ICX7750: ``` enable conf t int ve 2000 ipv6 addr 2620:57:e000:e::11/125 ipv6 nd suppress-ra ``` The next IP after this, `2620:57:e000:e::12`, will be given to the server. ### Choose a /56 to give to the server: `2620:57:e000:400::/56` ### Tell the ICX7750 the entire /56 is accessible over previous transit link: ``` enable conf t ipv6 route 2620:57:e000:400::/56 2620:57:e000:e::12 ``` The destination is your chosen `2620:57:e000:400::/56` subnet, the next-hop is the server end of the transit subnet, `2620:57:e000:e::12` ### On server, give it it's own address in the transit subnet: **Note**: this should be one address up from what the router (ICX7750) has. ``` nano /etc/network/interfaces auto eth1 iface eth1 inet6 static address 2620:57:e000:e::12 netmask 125 gateway 2620:57:e000:e::11 autoconf 0 ``` Now run the below command to assign the entire /56 to the server's loopback interface: **Note:** this uses Linux's [AnyIP](https://blog.widodh.nl/2016/04/anyip-bind-a-whole-subnet-to-your-linux-machine/) feature `ip -6 route add local 2620:57:e000:400::/56 dev lo` Your server will now respond to any address in the entire /56 - however most applications and daemons will complain when you try to bind them to an address in this block, since they're not *technically* assigned to any real linux interface. To solve this, enable the `net.ipv6.ip_nonlocal_bind` sysctl: `sysctl -w net.ipv6.ip_nonlocal_bind=1` Applications can now bind to any IP address in the /56. To make this permanent so it persists reboots, you need to edit `/etc/sysctl.conf`: ```nano /etc/sysctl.conf``` Add the following line and then save it: `net.ipv6.ip_nonlocal_bind = 1` The `ip -6 route` command we ran earlier to assign the /56 will also disappear on reboot, to make it persist reboots, add it as a `pre-up` command to our network interfaces file, under your transit subnet interface: ``` nano /etc/network/interfaces auto eth1 iface eth1 inet6 static address 2620:57:e000:e::12 netmask 125 gateway 2620:57:e000:e::11 autoconf 0 pre-up ip -6 route add local 2620:57:e000:400::/56 dev lo ``` ### Finding all the /64s to bind to If your application needs to be bound to each /64, stick our `2620:57:e000:400::/56` subnet into [this calculator](https://subnettingpractice.com/ipv6_subnetting.html), and choose /64s from the dropdown then press calculate: ![eeprom](../../data/other/64nix-1.png) Then simply bind each of your application instances to the first address in each /64 - For instance: ``` Instance 1 - 2620:57:e000:400::1/64 Instance 2 - 2620:57:e000:401::2/64 Instance 3 - 2620:57:e000:402::/64 etc etc etc ```