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Project: Evaluating SNMP Application Level Gateway (SNMP ALG) Eyal Kessler 043127786 Alexander Shifrin 319432720 Dmitri Gorbenko 319352258. SNMP – What is it?. SNMP is a simple protocol for remotely managing private network using an SNMP daemon. (On routers, web servers, etc.)
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Project:Evaluating SNMP Application Level Gateway (SNMP ALG)Eyal Kessler 043127786Alexander Shifrin 319432720Dmitri Gorbenko 319352258
NAT - Network Address Translation: Performs translations of the addresses contained in the IP header of a packet, according to a given translation table.
1.) Implementing a layer-4 proxy. The source address of incoming packets and the destination address of outgoing packets need to be changed from the proxy’s address to a different one.
2.) Private networks use non-certified internal IP addresses . In most cases it’s implemented by adding a software to an access router which scans IP headers of the incoming/outgoing packets and changes their destination/source IP addresses according to the rules. Hence, the use of externally illegal IP addresses is transparent to the outer world.
It translates the payload of the SNMP packet.
Handles only one out of the IP address representations (binary).
Limited transparency to the management application.
Quick and efficient.
(Also when derived from octet strings Handles all IP address representations)
May change overall packet size.
Lookup is computationally consuming.
of SNMP-ALG consisted of 2 main stages:
The needed conditions have been achieved while processing of 106 packets sent at bursts of 200 packets per burst.
For the case where a “no losses” is the criteria, we increased the rate until 10,000 packets per second was reached. Any rate beyond 10,000 would cause a noticeable drop in the success rate from 99.5% to lower values (at most 80%) .
The above results remain stable while changing different experiment parameters: number of successful lookups per packet, size of mapping file and position of matching row in it.