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Current Path : /etc/network/if-up.d/
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Current File : //etc/network/if-up.d/mtuipv6

#!/bin/bash -e
# injected by curtin installer

[ "${IFACE}" != "lo" ] || exit 0

# Trigger only if MTU configured
[ -n "${IF_MTU}" ] || exit 0

read PRE_DEV_MTU </run/network/${IFACE}_dev.mtu ||:
read CUR_DEV_MTU </sys/class/net/${IFACE}/mtu ||:
read PRE_IPV6_MTU </run/network/${IFACE}_ipv6.mtu ||:
read CUR_IPV6_MTU </proc/sys/net/ipv6/conf/${IFACE}/mtu ||:

if [ "${ADDRFAM}" = "inet6" ]; then
  # We need to check the underlying interface MTU and
  # raise it if the IPV6 mtu is larger
  if [ ${CUR_DEV_MTU} -lt ${IF_MTU} ]; then
      ip link set ${IFACE} mtu ${IF_MTU}
  fi
  # sysctl -q -e -w net.ipv6.conf.${IFACE}.mtu=${IF_MTU}
  echo ${IF_MTU} >/proc/sys/net/ipv6/conf/${IFACE}/mtu ||:

elif [ "${ADDRFAM}" = "inet" ]; then
  # handle the clobber case where inet mtu changes v6 mtu.
  # ifupdown will already have set dev mtu, so lower mtu
  # if needed.  If v6 mtu was larger, it get's clamped down
  # to the dev MTU value.
  if [ ${PRE_IPV6_MTU} -lt ${CUR_IPV6_MTU} ]; then
    # sysctl -q -e -w net.ipv6.conf.${IFACE}.mtu=${PRE_IPV6_MTU}
    echo ${PRE_IPV6_MTU} >/proc/sys/net/ipv6/conf/${IFACE}/mtu ||:
  fi
fi
exit 0