[GH-ISSUE #1487] UDP连接无法发送大于2K字节的帧，无法穿透 #1173

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opened 2026-05-05 12:45:12 -06:00 by gitea-mirror · 6 comments

gitea-mirror commented

2026-05-05 12:45:12 -06:00

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Originally created by @squarerlee on GitHub (Oct 29, 2019).
Original GitHub issue: https://github.com/fatedier/frp/issues/1487

Originally assigned to: @blizard863 on GitHub.

What version of frp are you using (./frpc -v or ./frps -v)?
服务器 0.29.0 的AMD64
客户端 0.29.0 的arm
What operating system and processor architecture are you using (go env)?
服务端操作系统：Windows Server 2008 R2 Enterprice
客户端操作系统：海思Hi3536平台的定制linux arm A17的CPU
Configures you used:
客服端配置如下：
[common]
server_addr = 123.123.123.123
server_port = 7000
token = xxxxxxxxxx
log_level = info
log_file = frpc.log
log_max_days = 7
login_fail_exit = false
protocol = tcp
tcp_mux = true

[3702]
type = udp
local_ip = 127.0.0.1
local_port = 3702
remote_port = 3702
use_compression = true
use_encryption = true

Steps to reproduce the issue:
1.服务端运行，客户端运行
2.使用另一内网的PC往服务端IP的3702端口发送数据，帧数据大小2Kbytes

Describe the results you received:
数据无法发送到客户端的对应端口，小些的包则正常收到，实际边界不一定是1518字节，未具体测试
客户端log报错内容：[W] [proxy.go:438] [3702] read from workConn for udp error: EOF
报错以后，必须重启客户端，不然小包的收发也不通

Describe the results you expected:
2Kbytes的帧，UTP正常收发数据

Additional information you deem important (e.g. issue happens only occasionally):

Can you point out what caused this issue (optional)
每次发送巨帧都会出现，是帧缓存设置大小过小？

Originally created by @squarerlee on GitHub (Oct 29, 2019). Original GitHub issue: https://github.com/fatedier/frp/issues/1487 Originally assigned to: @blizard863 on GitHub. **What version of frp are you using (./frpc -v or ./frps -v)?** 服务器 0.29.0 的AMD64 客户端 0.29.0 的arm **What operating system and processor architecture are you using (`go env`)?** 服务端操作系统：Windows Server 2008 R2 Enterprice 客户端操作系统：海思Hi3536平台的定制linux arm A17的CPU **Configures you used:** 客服端配置如下： [common] server_addr = 123.123.123.123 server_port = 7000 token = xxxxxxxxxx log_level = info log_file = frpc.log log_max_days = 7 login_fail_exit = false protocol = tcp tcp_mux = true [3702] type = udp local_ip = 127.0.0.1 local_port = 3702 remote_port = 3702 use_compression = true use_encryption = true **Steps to reproduce the issue:** 1.服务端运行，客户端运行 2.使用另一内网的PC往服务端IP的3702端口发送数据，帧数据大小2Kbytes **Describe the results you received:** 数据无法发送到客户端的对应端口，小些的包则正常收到，实际边界不一定是1518字节，未具体测试客户端log报错内容：[W] [proxy.go:438] [3702] read from workConn for udp error: EOF 报错以后，必须重启客户端，不然小包的收发也不通 **Describe the results you expected:** 2Kbytes的帧，UTP正常收发数据 **Additional information you deem important (e.g. issue happens only occasionally):** **Can you point out what caused this issue (optional)** 每次发送巨帧都会出现，是帧缓存设置大小过小？

gitea-mirror

2026-05-05 12:45:12 -06:00

closed this issue
added the
enhancement
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gitea-mirror commented

2026-05-05 12:45:16 -06:00

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@fatedier commented on GitHub (Oct 29, 2019):

目前内部写死的 buffer 大小是 1500，所以超过这个值的 UDP 包会无法收到，可以先手动修改代码中这个值，重新编译后测试下是否可以。

后续会改成可配置。

@fatedier commented on GitHub (Oct 29, 2019): 目前内部写死的 buffer 大小是 1500，所以超过这个值的 UDP 包会无法收到，可以先手动修改代码中这个值，重新编译后测试下是否可以。后续会改成可配置。

gitea-mirror commented

2026-05-05 12:45:16 -06:00

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@squarerlee commented on GitHub (Oct 29, 2019):

好的，谢谢

@squarerlee commented on GitHub (Oct 29, 2019): 好的，谢谢

gitea-mirror commented

2026-05-05 12:45:16 -06:00

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@hzexe commented on GitHub (Dec 2, 2019):