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feat(vpcnatgw): send gratuitous arp for nexthops at natgw initialization #5607

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Merged
merged 1 commit into from
Aug 19, 2025
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feat(vpcnatgw): send gratuitous arp for nexthops at natgw initialization #5607

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4 changes: 4 additions & 0 deletions dist/images/vpcnatgateway/nat-gateway.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,10 @@ function init() {
$iptables_cmd -t nat -A POSTROUTING -j SNAT_FILTER
$iptables_cmd -t nat -A SNAT_FILTER -j EXCLUSIVE_SNAT
$iptables_cmd -t nat -A SNAT_FILTER -j SHARED_SNAT

# Send gratuitous ARP for all the IPs on the external network interface at initialization
# This is especially useful to update the MAC of the nexthop we announce to the BGP speaker
ip -4 addr show dev net1 | awk '/inet /{print $2}' | cut -d/ -f1 | xargs -n1 arping -I net1 -c 3 -U
}


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