[SNMP4J] renewSocketAfterException() binds to a specific address

[Prema Upot]

Hi Frank,

In the default constructor, 

  public DefaultUdpTransportMapping() throws IOException {
    super(new UdpAddress(InetAddress.getLocalHost(), 0));
    socket = new DatagramSocket(udpAddress.getPort());
  }

the UdpAddress is initialized with localhost as you mentioned. But only the port is passed to DatagramSocket and thus the ip address it binds to is a wild card ipaddress. 

But in renewSocetAfterException(), Socket is initialized using both ip and port which causes the mismatch.

DatagramSocket s = new DatagramSocket(udpAddress.getPort(), udpAddress.getInetAddress());


Thanks,
Prema

-----Original Message-----
From: SNMP4J [mailto:snmp4j-bounces at agentpp.org] On Behalf Of Frank Fock
Sent: Tuesday, July 22, 2014 4:57 PM
To: snmp4j at agentpp.org
Subject: Re: [SNMP4J] renewSocketAfterException() binds to a specific address

Hi Prema,

The renewSocketAdterException(..) method of the DefaultUdpTransportMapping uses *exactly* the same UDP address as provided in the constructor. If you provided "0.0.0.0", it will be used again.
You wrote that you are using the default constructor. That one is *not* using "0.0.0.0", instead it uses the localhost IP address. It depends on your operating system and Java virtual machine which IP that is on a multi-home system.

Best regards,
Frank


Am 22.07.2014 20:18, schrieb Prema Upot:
> Hi,
>
> We initialize DefaultUdpTransportMapping using the default constructor and this makes sure the listening port binds to "0.0.0.0" address enabling sending and receiving UDP packets on any interface. But in renewSocketAfterException() the new socket is created using port and ipaddress as parameters and this causes a problems in a PC that is part of multiple networks.
> For example, we have a PC in 192.168.144.0 and 192.168.30.0 networks. After socket exception, the new socket that is created binds to "192.168.144.<ip>:<port>" instead of "0.0.0.0:<port>" and because of this we cannot communicate with 30.0 network any more.
>
> Thanks,
> Prema
>
>
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