Transport Hangout 28 December 2017

When accepting TCP/IPv6 and using net.inet6.ip6.v6only=0, netstat tries to print the IPv6 addresses as IPv4 addresses. The problem is that the endpoint has the INP_IPV4 and the INP_IPV6 flag set. This also confuses squid. A fix is under review at D13514.

When an SCTP application using an SCTP socket crashes an a core file has to be written, the kernel panics. The reason is that pru_sockaddr and pru_peeraddr are called by soo_fill_kinfo without setting the vnet. However, when pru_sockaddr and pru_peeraddr are called via the syscall interface, the vnet is set. A patch setting the vnet also in soo_fill_kinfo is under review in D13652.

tuexen@ mentioned that there are some issues when using TCP fastopen with FreeBSD acting as the server and Mac OS X as a client. It is not yet clear which side is responsible. tuexen@ will investigate or contact someone having done work with TCP fastopen.