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With the introduction of IPv6, single machines often get prefixes with more than one IP address assigned. However, without AnyIP and socket freebinding, many applications lack support to dynamically bind to arbitrary unconfigured addresses within these prefixes. Freebind enables the IP_FREEBIND socket option by hooking into socket library calls using LD_PRELOAD.
IPv6 services employing rate limiting often ban per /128 or per /64 in order to minimize collateral damage. If you have a statically routed prefix that is smaller than the prefix being banned, you can make use of freebind, which will bind sockets to random IP addresses from specified prefixes.
Clone and cd into the git repository, then run make install. In order for packetrand to be built successfully, libnetfilter-queue-dev is required.
Assume your ISP has assigned the subnet 2a00:1450:4001:81b::/64 to your server. In order to make use of freebinding, you first need to configure the Linux AnyIP kernel feature in order to be able to bind a socket to an arbitrary IP address from this subnet as follows:
