LwIP-hurd is a port of lwIP into Hurd. It was designed to replace the pfinet translator. The development of the lwip-hurd was carried out by Joan Lledó as part of the Google Summer of Code(GSoC) 2017. He has documented the process as a blog here.
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Building the translator
Installing the lwIP libraries
The core libraries of lwIP need to be installed before building the translator. The libraries can be installed by installing it as the Debian package https://salsa.debian.org/debian/lwip.
Building lwIP
The lwIP translator is built while building hurd from the source if the lwIP libraries had already been installed. To make the lwIP translator alone, follow the steps to configure the Hurd installation and use make lwip.
The translator can be tested using
settrans -fgap /servers/socket/2 ~/path/to/build/lwip/lwip -i /dev/eth0 -a a.b.c.d -g e.f.g.h -m i.j.k.l
where a.b.c.d is the IP address for the device, e.f.g.h is the default gateway and i.j.k.l is the netmask.