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authorStefano Brivio <sbrivio@redhat.com>2022-11-02 23:52:38 +0100
committerStefano Brivio <sbrivio@redhat.com>2022-11-04 12:04:32 +0100
commit73f50a76aac20a9c2fda67c5eba25661e2ebb119 (patch)
tree2d3302665ae733018f6c9f7fd1c01af832a2c227 /test/perf/passt_udp
parent7656a6f8888237b9e23d63666e921528b6aaf950 (diff)
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conf: Split the notions of read DNS addresses and offered ones
With --dns-forward, if the host has a loopback address configured as DNS server, we should actually use it to forward queries, but, if --no-map-gw is passed, we shouldn't offer the same address via DHCP, NDP and DHCPv6, because it's not going to be reachable. Problematic configuration: * systemd-resolved configuring the usual 127.0.0.53 on the host: we read that from /etc/resolv.conf * --dns-forward specified with an unrelated address, for example 198.51.100.1 We still want to forward queries to 127.0.0.53, if we receive one directed to 198.51.100.1, so we can't drop 127.0.0.53 from our list: we want to use it for forwarding. At the same time, we shouldn't offer 127.0.0.53 to the guest or container either. With this change, I'm only covering the case of automatically configured DNS servers from /etc/resolv.conf. We could extend this to addresses configured with command-line options, but I don't really see a likely use case at this point. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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