Duplicated Traffic Remover

The duplicated traffic remover function helps to eliminate multi captured Ethernet traffic from different links. This reduces the amount of traffic and overcomes difficulties with duplicated packets in monitoring Systems.

Why do we have duplicated traffic ?

In modern NGN or IMS VoIP networks several links have to be tapped to get a full view of the network. Some of these links can be redundant or load balanced resulting in duplicated packets on the monitoring output. But traffic on the monitoring equipment could not only include duplicated packets, in most of the cases the same traffic is available three or four times.

Duplicated packets do not only cause unnecessary high traffic but also has a negative impact on quality of the call trace decoding. It easily happens that some decoding engines can not handle duplicated traffic and produce wrong call traces.

To overcome this problem with normal IP filtering this is nearly impossible because in most systems the IP addresses are dynamic. If IP addresses are static it is still a very complex and time consuming work to filter out duplicated packets.

The solution to remove duplicated packets is the traffic remover function of the Packetmaster, which does the job automatically.

The user only has to select a time frame (e.g. 100ms) and within this time frame every duplicated packet will be discarded automatically. The packet remover function is realized in hardware so even high traffic payloads are handled without problems.

Application protected links.

In the case of using protected links you have two identical links which carry the same load. One link is used for communication while the other link is on standby.
In case of a problem with link one the equipment switches automatically to the second link without any interruption. When monitoring such links the traffic appears twice at the monitoring equipment. With the duplicate packet remover feature this is no issue anymore because the duplicated traffic will be discarded automatically. The switching procedure has no impact on captured traffic.

New Feature Duplicate packet remover with different MAC address

In IMS networks you have the situation that you will find duplicated packets, but they will be sent out from different routers or router ports therefore the MAC address is different. To identify such packets as identical we have developed a very smart application. We look deeper into the packet and find unique marks.

Currently TCP and UDP is supported by this feature.