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udp: fix proxy protocol header sent on every packet instead of first packet only #5119

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Merged
fatedier merged 1 commit into from
Jan 9, 2026
Merged

udp: fix proxy protocol header sent on every packet instead of first packet only #5119

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4 changes: 4 additions & 0 deletions Release.md
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Original file line number Diff line number Diff line change
Expand Up @@ -2,3 +2,7 @@

* frpc now supports a `clientID` option to uniquely identify client instances. The server dashboard displays all connected clients with their online/offline status, connection history, and metadata, making it easier to monitor and manage multiple frpc deployments.
* Redesigned the frps web dashboard with a modern UI, dark mode support, and improved navigation.

## Fixes

* Fixed UDP proxy protocol sending header on every packet instead of only the first packet of each session.
4 changes: 2 additions & 2 deletions pkg/proto/udp/udp.go
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Expand Up @@ -124,8 +124,8 @@ func Forwarder(dstAddr *net.UDPAddr, readCh <-chan *msg.UDPPacket, sendCh chan<-
}
mu.Unlock()

// Add proxy protocol header if configured
if proxyProtocolVersion != "" && udpMsg.RemoteAddr != nil {
// Add proxy protocol header if configured (only for the first packet of a new connection)
if !ok && proxyProtocolVersion != "" && udpMsg.RemoteAddr != nil {
ppBuf, err := netpkg.BuildProxyProtocolHeader(udpMsg.RemoteAddr, dstAddr, proxyProtocolVersion)
if err == nil {
// Prepend proxy protocol header to the UDP payload
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