bot47 Asked: 2011-12-10 08:22:16 +0800 CST2011-12-10 08:22:16 +0800 CST 2011-12-10 08:22:16 +0800 CST Setting MTU Per Destination Host 772 I'd like to change the MTU per host as I have a mixed infrastructure where not all devices support the same MTU. I'm on OS X 10.7 and like to set some MTU per destination host and a default one. mac tcp mtu 1 Answers Voted Best Answer voretaq7 2011-12-10T12:15:48+08:002011-12-10T12:15:48+08:00 As the others pointed out in the comments, MTU is set per-interface, and the only "per-host" capability available is Path MTU Discovery (PMTU). OS X has the sysctl knob for Path MTU Discovery -- It appears to be on by default in Lion: % sysctl net.inet.tcp.path_mtu_discovery net.inet.tcp.path_mtu_discovery: 1 so things should be pretty much self-tuning.
As the others pointed out in the comments, MTU is set per-interface, and the only "per-host" capability available is Path MTU Discovery (PMTU).
OS X has the sysctl knob for Path MTU Discovery -- It appears to be on by default in Lion:
so things should be pretty much self-tuning.