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network: dhcp4: ignore null dns address
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@ -519,6 +519,9 @@ static int link_set_dns_routes(Link *link, const struct in_addr *gw) {
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route->mtu = link->network->dhcp_route_mtu;
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for (int i = 0; i < n; i ++) {
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if (in4_addr_is_null(&dns[i]))
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continue;
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route->dst.in = dns[i];
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r = dhcp_route_configure_auto(route, link, gw);
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