Hi,

Does libpcap miss a lot of packets if plugged in a 100BT network with high 
traffic.

This depends on

1. what filter you are using. If you choose a very specific filter. you can easily 
getaway without anylosses.

2. It also depends on how costly operations you are doing on each packet that you 
capture.  i mean how much time is spend between 2 pcap_reads.

Even if you are doing the minimum analysis on each of the caprtured packets there is 
an upper limit on the volume of traffic you can monitor, which depends on the 
performance on the pcap_read / pcap_loop.

Regarding tcpdump, it depends on what options you turn on, how costly operations you 
are doing on each packet. For eg if you write to disk every packet which you 
capture it might might be costly..


cheers
ashley




I was wondering if anyone has ever checked the performance of tcpdump and 
especially libpcap under a 100BT connection (or even a 10BT although I am 
pretty sure there is no significant packet loss on such a line).

Does libpcap miss a lot of packets if plugged in a 100BT network with high 
traffic. Are there any bottlenecks in tcpdump (or libpcap) that might cause 
packet loss?

Thanks

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