CODEWITHSUNDEEP
erlangip
0xAX
0xAX

Reputation: 21837

Erlang connect by external ip address

I write simple server application in erlang.

Code of this application: https://gist.github.com/783117

I try to connect to it with telnet. When I connect to localhost or local ip addres which get from route it's ok, but when i try to connect to server with external ip it's don't work.

What's wrong?

If i use options with {0,0,0,0}:

Opts = [binary, {ip, 0,0,0,0}, {reuseaddr, true},
            {keepalive, false}, {active, false}],

I get:

exception exit: badarg

netstat -ltn | grep 110

tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN

route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

192.168.1.0     0.0.0.0         255.255.255.0   U     202    0        0 eth0

0.0.0.0         192.168.1.1     0.0.0.0         UG    202    0        0 eth0

Thank you.

Upvotes: 0

Views: 865

Answers (2)

Alin
Alin

Reputation: 818

Instead of {ip, 0,0,0,0}, you should pass: {ip, {0,0,0,0}}. You passed a tuple having 5 elements, instead of a tuple of 2 elements.

Upvotes: 0

ssmir
ssmir

Reputation: 1542

From gen_tcp manual:

listen(Port, Options) -> {ok, ListenSocket} | {error, Reason}

...

Sets up a socket to listen on the port Port on the local host.

...

{ip, ip_address()}

If the host has several network interfaces, this option specifies which one to listen on.

I suppose your server listens only on the local host. That is, you can't connect using other addresses. You probably need to use the ip option. Maybe it's possible to use INADDR_ANY somehow like in C but I don't know.

[edit]

It appeared that it listens on INADDR_ANY by default even without ip option (thanks to I GIVE CRAP ANSWERS). And I can connect from other machines with the original code shared by the author. However firewall is disabled on my machine

Upvotes: 1

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