https://github.com/devlights/go-tcp-keepalive-example
This is a example of exchanging keep-alive probes by golang (SO_KEEPALIVE).
https://github.com/devlights/go-tcp-keepalive-example
Last synced: about 2 months ago
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This is a example of exchanging keep-alive probes by golang (SO_KEEPALIVE).
- Host: GitHub
- URL: https://github.com/devlights/go-tcp-keepalive-example
- Owner: devlights
- License: mit
- Created: 2023-06-23T07:05:55.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2023-06-23T07:48:40.000Z (almost 2 years ago)
- Last Synced: 2025-02-12T08:58:29.783Z (4 months ago)
- Language: Go
- Size: 3.91 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# go-tcp-keepalive-example
This is a example of exchanging keep-alive probes by golang (SO_KEEPALIVE).
## Environments
```sh
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.2 LTS
Release: 22.04
Codename: jammy
```
```sh
$ go version
go version go1.20.5 linux/amd64
```
The sample code in this repository runs on both Windows and Linux.
## Requirements
### Task (go-task)
```sh
$ go install github.com/go-task/task/v3/cmd/task@latest
```
### tcpdump
```sh
$ sudo apt update
$ sudo apt install -y tcpdump
```
## How to Run
Open three terminals. the first terminal, do the following
```sh
$ task capture
```
the second terminal, do the following
```sh
$ task server
```
the third terminal, do the following
```sh
$ task client
```
After a while, the first terminal outputs the following results.
The following is the result of a run on Gitpod.
```sh
$ task capture
task: [capture] sudo tcpdump -i lo 'tcp and port 12345 and tcp[13] & 16 != 0 and tcp[12] & 15 = 0'
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on lo, link-type EN10MB (Ethernet), snapshot length 262144 bytes
07:42:59.109181 IP localhost.12345 > localhost.57006: Flags [S.], seq 1096637414, ack 3661790707, win 43690, options [mss 65495,sackOK,TS val 1727619187 ecr 1727619187,nop,wscale 7], length 0
07:42:59.109200 IP localhost.57006 > localhost.12345: Flags [.], ack 1, win 342, options [nop,nop,TS val 1727619187 ecr 1727619187], length 0
07:43:01.120277 IP localhost.57006 > localhost.12345: Flags [.], ack 1, win 342, options [nop,nop,TS val 1727621199 ecr 1727619187], length 0
07:43:01.120283 IP localhost.12345 > localhost.57006: Flags [.], ack 1, win 342, options [nop,nop,TS val 1727621199 ecr 1727619187], length 0
07:43:03.132273 IP localhost.57006 > localhost.12345: Flags [.], ack 1, win 342, options [nop,nop,TS val 1727623211 ecr 1727621199], length 0
07:43:03.132283 IP localhost.12345 > localhost.57006: Flags [.], ack 1, win 342, options [nop,nop,TS val 1727623211 ecr 1727619187], length 0
07:43:05.148284 IP localhost.57006 > localhost.12345: Flags [.], ack 1, win 342, options [nop,nop,TS val 1727625227 ecr 1727623211], length 0
07:43:05.148295 IP localhost.12345 > localhost.57006: Flags [.], ack 1, win 342, options [nop,nop,TS val 1727625227 ecr 1727619187], length 0
07:43:07.164286 IP localhost.57006 > localhost.12345: Flags [.], ack 1, win 342, options [nop,nop,TS val 1727627243 ecr 1727625227], length 0
07:43:07.164292 IP localhost.12345 > localhost.57006: Flags [.], ack 1, win 342, options [nop,nop,TS val 1727627243 ecr 1727619187], length 0
07:43:09.116306 IP localhost.57006 > localhost.12345: Flags [F.], seq 1, ack 1, win 342, options [nop,nop,TS val 1727629195 ecr 1727627243], length 0
07:43:09.116396 IP localhost.12345 > localhost.57006: Flags [F.], seq 1, ack 2, win 342, options [nop,nop,TS val 1727629195 ecr 1727629195], length 0
07:43:09.116440 IP localhost.57006 > localhost.12345: Flags [.], ack 2, win 342, options [nop,nop,TS val 1727629195 ecr 1727629195], length 0
```