- The asyncore-based transport subsystem extended to support POSIX

  sendmsg()/recvmsg() based socket communication what could be used,
  among other things, in the context of a transparent SNMP proxy
  application. Technically, the following features were brought
  into pysnmp with this update:
  * Sending SNMP packets from a non-local IP address
  * Receiving IP packets for non-local IP addresses
  * Responding to SNMP requests from exactly the same IP address
    the query was sent to. This proves to be useful when listening
    on both primary and secondary IP interfaces.

1 files changed, 13 insertions, 0 deletions

diff --git a/pysnmp/carrier/base.py b/pysnmp/carrier/base.py
index 448b74d4..51c76eb0 100644
--- a/pysnmp/carrier/base.py
+++ b/pysnmp/carrier/base.py
@@ -179,8 +179,21 @@ class AbstractTransportDispatcher:
         self.unregisterRecvCbFun()
         self.unregisterTimerCbFun()
 
+class AbstractTransportAddress:
+    _localAddress = None
+    def setLocalAddress(self, s):
+        self._localAddress = s
+        return self
+ 
+    def getLocalAddress(self):
+        return self._localAddress
+
+    def clone(self, localAddress=None):
+        return self.__class__(self).setLocalAddress(localAddress is None and self.getLocalAddress() or localAddress)
+
 class AbstractTransport:
     protoTransportDispatcher = None
+    addressType = AbstractTransportAddress
     _cbFun = None
     @classmethod
     def isCompatibleWithDispatcher(cls, transportDispatcher):