Date: Wed, 13 Oct 2004 16:41:25 -0700 From: Denis Guerrero <dguerrero@cisdata.net> To: freebsd-questions@freebsd.org Subject: changing MTU size for Netgraph pseudo devices Message-ID: <65C3B176-1D71-11D9-BABE-000A95B49708@cisdata.net>
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I recently came across the documentation provided at http://archives.neohapsis.com/archives/sf/ids/2003-q4/0029.html for implementing the Netgraph Fast-Channel kernel module on FreeBSD systems it works great. One thing that I have not been able to figure out is how to change the mtu on the pseudo device to anything greater than 1500(I want mtu 9000). If I do #ifconfig fec0 mtu 1000 (this works if its any value less than 1500) but, if I do #ifconfig fec0 mtu 9000 (I get the following: " ifconfig: ioctl (set mtu): Invalid argument ") I also tried changing the "NG_FEC_MTU_Default 1500" line in the ng_fec.h file to NG_FEC_MTU_Default 9000 and then do a build/install new kernel and build/install world. Still have no success. Any suggestions would be greatly appreciated. HERE IS MY ENTIRE SCRIPT: #! /bin/sh echo "load module"; cd /usr/src/sys/modules/netgraph/fec/ kldload /usr/src/sys/modules/netgraph/fec/ng_fec.ko echo "kldstat results"; kldstat echo "create psuedo fec interfaces"; ngctl mkpeer fec dummy fec echo "bind physical interfaces to pseudo devices"; ngctl msg fec0: add_iface '"em0"' ngctl msg fec0: add_iface '"em1"' echo "set capture mode for each pseudo interface"; ngctl msg fec0: set_mode_inet echo "set all physical and pseudo interfaces to promiscuous mode"; ifconfig fec0 promisc ifconfig em0 promisc ifconfig em1 promisc echo "bring up pseudos"; ifconfig fec0 up Regards, Denis
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