diff options
Diffstat (limited to 'fw/src/fw.c')
| -rw-r--r-- | fw/src/fw.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fw/src/fw.c b/fw/src/fw.c index 4dc6d79..70bcc5c 100644 --- a/fw/src/fw.c +++ b/fw/src/fw.c @@ -306,9 +306,13 @@ wireup(Wire *w) if(fprint(w->cfd, "bind pkt") < 0) sysfatal("%s: bind pkt: %r", w->net); /* - * pktmedium claims 4096 with no link header; a card is 1514 with - * 14. Left alone the protected stack emits packets the card - * refuses, and only remote peers capping the MSS hide it. + * pktmedium claims 4096 with no link header, where a card is 1514 + * with 14, so a stack behind one of these thinks it may send 4096 + * bytes. In card mode devether then refuses the frame outright; + * between two stacks the packet only has further to go before an + * ether interface refuses it. Either way 1500 is what the traffic + * will meet in the end, so say so here. Left alone, the only + * thing hiding it is remote peers capping the MSS. */ if(fprint(w->cfd, "mtu 1500") < 0) fprint(2, "fw: %s: cannot set mtu: %r\n", w->net); |