Add --ttl flag for configurable packet TTL#10
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schmiatz wants to merge 4 commits intothomseddon:masterfrom
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Add --ttl flag for configurable packet TTL#10schmiatz wants to merge 4 commits intothomseddon:masterfrom
schmiatz wants to merge 4 commits intothomseddon:masterfrom
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Uses golang.org/x/net/ipv4 to set the IP TTL on forwarding connections, which is needed when forwarding to multicast addresses (OS defaults TTL to 1). Co-Authored-By: Claude Opus 4.6 <[email protected]>
Use SetMulticastTTL via ipv4.PacketConn for multicast addresses (e.g. 233.x.x.x) since the kernel ignores the unicast TTL for multicast traffic and defaults it to 1. Co-Authored-By: Claude Opus 4.6 <[email protected]>
The ipv4.PacketConn.SetMulticastTTL wrapper does not work on connected (DialUDP) sockets. Set the socket option directly via SyscallConn and SetsockoptInt instead. Co-Authored-By: Claude Opus 4.6 <[email protected]>
On connected UDP sockets the kernel may check either option depending on the send path. Set both to cover unicast and multicast targets. Removes golang.org/x/net/ipv4 dependency. Co-Authored-By: Claude Opus 4.6 <[email protected]>
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--ttlflag (andTTLenv var) to control the IP TTL on forwarded packetsIP_TTLandIP_MULTICAST_TTLvia syscall on all forwarding socketsUsage
./replicator --listen-port=9000 --forward=233.84.178.1:1002 --ttl=64
When
--ttlis not set (or set to 0), the OS default behavior is preserved.