On Sun, 2015-05-24 at 17:50 +0800, hshh wrote: > Hi, > I can't build this version on FreeBSD 10.1 amd64, > worker-vpn.c:662:50: error: use of undeclared identifier 'IPV6_MTU' > if (getsockopt(ws->dtls_tptr.fd, IPPROTO_IPV6, IPV6_MTU, > &mtu, &len) < 0 || mtu < 1280) { Hello, Do you know what is the equivalent of IPV6_MTU in freebsd?