config/dhcpc/dhcpcd-hooks/10-mtu

   1 # Configure the MTU for the interface
   2
   3 eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
   4
   5 set_mtu()
   6 {
   7         local mtu=$1
   8         ip link set "$interface" mtu "$mtu"
   9
  10         # test for buggy nic that lose link at mtu set...
  11         carrier=`cat /sys/class/net/$interface/carrier`
  12         if [ "$carrier" == "0" ]; then
  13                 syslog info "Warning! Carrier loss after MTU set. Reinit ..."
  14                 ip link set "$interface" down
  15                 ip link set "$interface" up
  16         fi
  17 }
  18 if [ -n "$new_interface_mtu" ] && $if_up; then
  19         if [ $RED_DHCP_FORCE_MTU -ge 576 ]; then
  20                 new_interface_mtu=$RED_DHCP_FORCE_MTU
  21         fi
  22         if [ ! "$new_interface_mtu" == "$ifmtu" ]; then
  23                 # The smalled MTU dhcpcd can work with is 576
  24                 if [ "$new_interface_mtu" -gt 576 ]; then
  25                         if set_mtu "$new_interface_mtu"; then
  26                                 syslog info "MTU set to $new_interface_mtu"
  27                         fi
  28                 fi
  29         fi
  30 fi
  31