  A router is a device, in the computer networks, that is used to forward a
data packet. Because of its function, the router becomes an important role in
measuring the performance of computer networks. It needs to process the
incoming data packets with high speed and minimum delay. Therefore, the router
must have supported with a good security system as well. The activation of
security applications and data encryptions in the router and firewall can
consume the resources of CPU from the additional computations and they are able
to affect the degradation of its performance. Furthermore, the security
mechanisms in the router could bring a possibility of congestion in the
networks during the ON/OFF functioning of security so it might influence the
performance of the router in forwarding the data packets. A quantitative
analysis based on queuing theory may be used to measure and predict as well as
improve the performance of the router. In this paper, some scenarios of
simulation will be carried out to analyze the effect of security function in
the router with high-speed networks. The schemes use generalized exponential
(GE-type) distribution to reflect bursty interarrival and service time at a
router. The results show that the security function in the router could bring
the decreasing of its performance.
