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Internal change. #12370

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Internal change. #12370

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5 changes: 5 additions & 0 deletions runsc/sandbox/network.go
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Original file line number Diff line number Diff line change
Expand Up @@ -507,6 +507,11 @@ func routesForIface(iface net.Interface, disableIPv6 bool) ([]boot.Route, *boot.
var routes []boot.Route
for _, r := range rs {
mtu := uint32(r.MTU)
// If the route MTU is unspecified or exceeds the interface MTU, use the
// interface MTU - in GKE this might not be set or you can completely break it in the configmap.
if mtu == 0 || mtu > uint32(iface.MTU) {
mtu = uint32(iface.MTU)
}

// Is it a default route?
if r.Dst == nil {
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