what is the reason "Server error: response IP/port"

[shellus]

stun/discover.go line 111

if resp != nil &&
        (resp.serverAddr.IP() == addr.IP.String() ||
            resp.serverAddr.Port() == uint16(addr.Port)){
// Run to this position, on behalf of what happened?
}

[shellus]

i change code to

    if resp != nil &&
        (resp.serverAddr.IP() == addr.IP.String() ||
            resp.serverAddr.Port() == uint16(addr.Port)) {
        return NATError, mappedAddr, errors.New(fmt.Sprintf("Server error: response IP/port resp addr[%s][%d] local addr[%s][%d]", resp.serverAddr.IP(), resp.serverAddr.Port(), addr.IP.String(), uint16(addr.Port)))
    }

run go-stun.exe -vvv echo

$ go-stun.exe  -vvv
2017/10/26 11:26:55 Do Test1
2017/10/26 11:26:55 Send To: 217.10.68.152:3478
2017/10/26 11:26:55
00000000  00 01 00 18 21 12 a4 42  ff ae d5 56 fd cd b4 74  |....!..B...V...t|
00000010  59 62 7c ed 80 22 00 0c  53 74 75 6e 43 6c 69 65  |Yb|.."..StunClie|
00000020  6e 74 00 00 80 28 00 04  3b cb 0f aa              |nt...(..;...|
2017/10/26 11:26:55
00000000  01 01 00 44 21 12 a4 42  ff ae d5 56 fd cd b4 74  |...D!..B...V...t|
00000010  59 62 7c ed 00 01 00 08  00 01 8d 31 2f 58 e6 ca  |Yb|........1/X..|
00000020  00 04 00 08 00 01 0d 96  d9 0a 44 98 00 05 00 08  |..........D.....|
00000030  00 01 0d 97 d9 74 7a 88  80 20 00 08 00 01 ac 23  |.....tz.. .....#|
00000040  0e 4a 42 88 80 22 00 10  56 6f 76 69 64 61 2e 6f  |.JB.."..Vovida.o|
00000050  72 67 20 30 2e 39 36 00                           |rg 0.96.|
2017/10/26 11:26:55 Received: {packet nil: false, local: 47.88.230.202:36145, remote: 217.10.68.152:3478, changed: 217.116.122.136:3479, other: <nil>, identical: false}
2017/10/26 11:26:55 Do Test2
2017/10/26 11:26:55 Send To: 217.10.68.152:3478
2017/10/26 11:26:55
00000000  00 01 00 20 21 12 a4 42  2b c0 3c 5f d0 96 5c 8c  |... !..B+.<_..\.|
00000010  6b 34 b0 9c 80 22 00 0c  53 74 75 6e 43 6c 69 65  |k4..."..StunClie|
00000020  6e 74 00 00 00 03 00 04  00 00 00 06 80 28 00 04  |nt...........(..|
00000030  91 78 5f bf                                       |.x_.|
2017/10/26 11:26:56
00000000  01 01 00 44 21 12 a4 42  2b c0 3c 5f d0 96 5c 8c  |...D!..B+.<_..\.|
00000010  6b 34 b0 9c 00 01 00 08  00 01 8d 31 2f 58 e6 ca  |k4.........1/X..|
00000020  00 04 00 08 00 01 0d 97  d9 74 7a 88 00 05 00 08  |.........tz.....|
00000030  00 01 0d 97 d9 74 7a 88  80 20 00 08 00 01 ac 23  |.....tz.. .....#|
00000040  0e 4a 42 88 80 22 00 10  56 6f 76 69 64 61 2e 6f  |.JB.."..Vovida.o|
00000050  72 67 20 30 2e 39 36 00                           |rg 0.96.|
2017/10/26 11:26:56 Received: {packet nil: false, local: 47.88.230.202:36145, remote: 217.10.68.152:3478, changed: 217.116.122.136:3479, other: <nil>, identical: false}
Server error: response IP/port resp addr[217.10.68.152][3478] local addr[217.10.68.152][3478]

[shellus]

i use ss-redir Transparent Proxying and some iptables REDIRECT

#add IP mark， tproxy usage
ip rule add fwmark 0x01/0x01 table 100
ip route add local 0.0.0.0/0 dev lo table 100
#UDP
iptables -t mangle -N SSUDP
iptables -t mangle -A SSUDP -d 47.88.230.202/32 -j RETURN
iptables -t mangle -A SSUDP -d 0.0.0.0/8 -j RETURN
iptables -t mangle -A SSUDP -d 10.0.0.0/8 -j RETURN
iptables -t mangle -A SSUDP -d 127.0.0.0/8 -j RETURN
iptables -t mangle -A SSUDP -d 169.254.0.0/16 -j RETURN
iptables -t mangle -A SSUDP -d 172.16.0.0/12 -j RETURN
iptables -t mangle -A SSUDP -d 192.168.0.0/16 -j RETURN
iptables -t mangle -A SSUDP -d 224.0.0.0/4 -j RETURN
iptables -t mangle -A SSUDP -d 240.0.0.0/4 -j RETURN
iptables -t mangle -A SSUDP -p udp -j TPROXY --on-port 12345 --on-ip 0.0.0.0 --tproxy-mark 0x1/0x1
iptables -t mangle -A PREROUTING -j SSUDP

#TCP
iptables -t nat -N SSTCP
iptables -t nat -A SSTCP -d 47.88.230.202/32 -j RETURN
iptables -t nat -A SSTCP -d 0.0.0.0/8 -j RETURN
iptables -t nat -A SSTCP -d 10.0.0.0/8 -j RETURN
iptables -t nat -A SSTCP -d 127.0.0.0/8 -j RETURN
iptables -t nat -A SSTCP -d 169.254.0.0/16 -j RETURN
iptables -t nat -A SSTCP -d 172.16.0.0/12 -j RETURN
iptables -t nat -A SSTCP -d 192.168.0.0/16 -j RETURN
iptables -t nat -A SSTCP -d 224.0.0.0/4 -j RETURN
iptables -t nat -A SSTCP -d 240.0.0.0/4 -j RETURN
iptables -t nat -A SSTCP -p tcp -j REDIRECT --to-ports 12345
iptables -t nat -A PREROUTING -j SSTCP

[shellus]

My udp and tcp communication can be used normally. And is through the proxy server. Just go-stun.exe will be given

[ccding]

the stun protocol doesn't work when you are using a proxy

[shellus]

What is the reason for it?

[ccding]

what do you want to do with stun with proxy? between client and proxy? or between proxy and server? you should run the protocol separately in each pair of them

[shellus]

I was wondering if I used the proxy mode to run go-stun would have problems, then I did other things that would also have this problem