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973b0bf19d
This might fix the issue that GCE is not setting the MTU from the DHCP response. The documentation says this is shipped but it is not in Alpine, this one is from a NetBSD install. Signed-off-by: Justin Cormack <justin.cormack@docker.com>
39 lines
981 B
Plaintext
39 lines
981 B
Plaintext
# Configure the MTU for the interface
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mtu_dir="$state_dir/mtu"
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set_mtu()
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{
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local mtu=$1
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if [ -w /sys/class/net/$interface/mtu ]; then
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echo "$mtu" >/sys/class/net/$interface/mtu
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else
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ifconfig "$interface" mtu "$mtu"
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fi
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}
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if [ "$reason" = PREINIT -a -e "$mtu_dir/$interface" ]; then
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rm "$mtu_dir/$interface"
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elif [ -n "$new_interface_mtu" ] && $if_up; then
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# The smalled MTU dhcpcd can work with is 576
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if [ "$new_interface_mtu" -ge 576 ]; then
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if set_mtu "$new_interface_mtu"; then
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syslog info "$interface: MTU set to $new_interface_mtu"
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# Save the MTU so we can restore it later
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if [ ! -e "$mtu_dir/$interface" ]; then
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mkdir -p "$mtu_dir"
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echo "$ifmtu" > "$mtu_dir/$interface"
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fi
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fi
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fi
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elif [ -e "$mtu_dir/$interface" ]; then
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if $if_up || $if_down; then
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# No MTU in this state, so restore the prior MTU
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mtu=$(cat "$mtu_dir/$interface")
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syslog info "$interface: MTU restored to $mtu"
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set_mtu "$mtu"
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rm "$mtu_dir/$interface"
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fi
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fi
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