"Error making request: Get "https://1.1.1.1": dial tcp 1.1.1.1:443: connect: network is unreachable" with marked Dial.

[samueljaydan]

Go version

go version go1.22.0 linux/amd64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/root/.cache/go-build'
GOENV='/root/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/root/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/root/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.22.0'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/test/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3929458663=/tmp/go-build -gno-record-gcc-switches'

What did you do?

ip route show table WAN1
default via 10.10.12.1 dev enp2s0

ip route show table WAN2
default via 192.168.1.1 dev enp4s0

# ROUTING TABLE FOR WAN1
ip route flush table WAN1 2>/dev/null
ip route add table WAN1 default via 10.10.12.1 dev enp2s0
# ROUTING TABLE FOR WAN2
ip route flush table WAN2 2>/dev/null
ip route add table WAN2 default via 192.168.1.1 dev enp4s0
# FwMark Tables
ip rule del from all fwmark 0x1 lookup WAN1 2>/dev/null
ip rule del from all fwmark 0x2 lookup WAN2 2>/dev/null
ip rule del from all fwmark 0x2 2>/dev/null
ip rule del from all fwmark 0x1 2>/dev/null
ip rule add fwmark 1 table WAN1
ip rule add fwmark 2 table WAN2

package main

import (
	"context"
	"fmt"
	"net"
	"net/http"
	"os"
	"syscall"
	"time"
)


func main() {
	// Mark değeri
	const markValue = 2 

	// Custom transport with the dialer that sets the SO_MARK option
	transport := &http.Transport{
		DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
			dialer := &net.Dialer{
				Timeout:   30 * time.Second,
				KeepAlive: 30 * time.Second,
			}
			conn, err := dialer.DialContext(ctx, network, addr)
			if err != nil {
				return nil, err
			}
			rawConn, err := conn.(interface {
				SyscallConn() (syscall.RawConn, error)
			}).SyscallConn()
			if err != nil {
				conn.Close()
				return nil, err
			}
			if err := rawConn.Control(func(fd uintptr) {
				syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, markValue)
			}); err != nil {
				conn.Close()
				return nil, err
			}
			return conn, nil
		},
	}

	// HTTP client using the custom transport
	client := &http.Client{
		Transport: transport,
	}

	// Creating a new request to 1.1.1.1
	req, err := http.NewRequest("GET", "https://1.1.1.1", nil)
	if err != nil {
		fmt.Println("Error creating request:", err)
		os.Exit(1)
	}

	// Sending the request
	resp, err := client.Do(req)
	if err != nil {
		fmt.Println("Error making request:", err)
		os.Exit(1)
	}
	defer resp.Body.Close()

	// Output the response status
	fmt.Println("Response status:", resp.Status)
}

What did you see happen?

"Error making request: Get "https://1.1.1.1": dial tcp 1.1.1.1:443: connect: network is unreachable" with marked Dial.

What did you expect to see?

wan1 => fwmark 1 => http request success via mark 1
wan2 => fwmark 2 => http request success via mark 2

[Sean Liao]

This doesn't really look like a bug in Go, rather in how you're using it.

Unlike many projects, the Go project does not use GitHub Issues for general discussion or asking questions. GitHub Issues are used for tracking bugs and proposals only.

For questions please refer to https://github.com/golang/go/wiki/Questions
Unlike many projects, the Go project does not use GitHub Issues for general discussion or asking questions. GitHub Issues are used for tracking bugs and proposals only.

For questions please refer to https://github.com/golang/go/wiki/Questions