Dear Maintainer, just as a side note, a similar bug was submitted against the basilisk2 package.
https://bugs.debian.org/922323 Another user of slirp is qemu, which had some changes in that area, which seems to have evolved into this library: https://gitlab.freedesktop.org/slirp/libslirp https://gitlab.freedesktop.org/slirp/libslirp/blob/master/src/ip.h#L214 Kind regards, Bernhard