One more diff: http://pdp-11.nsk.ru/~form/files/bridge/bridge-tap.patch It contains my previous path for OpenBSD and adds support for OpenBSD/Linux `tun' interface, so you can use it for SimH: bridge.conf: ------------ [bridge] tunnel @tun0 ------------ pdp11.ini: ------------ att xq tun0 ------------ On 11/22/2011 09:24 AM, Oleg Safiullin wrote: On 11/22/2011 02:25 AM, Johnny Billquist wrote: Ok. After some whacky hacking to merge what Hans sent me, I've uploaded a new version at http://www.update.uu.se/~bqt/hecnet o Update for OpenBSD to avoid loops. o Drop MAX() definition - it isn't used --- bridge.c.orig Tue Nov 22 02:17:15 2011 +++ bridge.c Tue Nov 22 09:21:34 2011 @@ -70,8 +70,6 @@ #define ETHERTYPE_MOPRC 0x6002 #define ETHERTYPE_LOOPBACK 0x9000 -#define MAX(a,b) (a>b?a:b) - /* This is a very simple and small program for bpf that just filters out anything by any protocol that we *know* we're not interested in. @@ -248,6 +246,13 @@ perror("BIOCSHDRCMPLT"); exit(1); } +#ifdef __OpenBSD__ + i = BPF_DIRECTION_OUT; + if (ioctl(bridge[bcnt].fd,BIOCSDIRFILT,&i)) { + perror("BIOCSDIRFILT"); + exit(1); + } +#endif #endif found = -1;