I have made a bridge using the Packet Capture Library
I set the two nics to promiscous mode and transfer packet
between the two packet capture handles
A piece of the code I use for initializing the packet capture device descriptor---
.....
pcap_t *pd;
pd = (pcap_t *)malloc(sizeof(*pd));
if (pd == NULL) {
printf("memory allocation error");
}
if((pd=pcap_open_live(device,BUFFSIZE,1,0,errbuf))==NULL)
{printf("pcap_open_live: %s",errbuf);
exit(1);
};
v = 1;
if (ioctl(pd->fd, BIOCIMMEDIATE, &v) < 0) {
printf("can't set BIOCIMMEDIATE");
exit(1);
}
..................
Now the problem is efficiency !!!
The RTT for a ping packet to traverse across the bridge takes a fastest of about 3ms
when
run as normal process
and about 2ms when run as daemon. But when setting
gateway_enable="YES"
in rc.conf the RTT is less than 1 ms. (i.e. FreeBSD Box acting as bridge)
I have FreeBSD 5.1 BOX.
I used Packet Capture Library(libpcap.a) because I could find of none libraries in
capturing packets that
could return with the ethernet header. Further I could not find good usage maunal on
BPF.
In the above code setting the TIMEOUT value to 0 also didn't improve the time taken to
capture and transmit the packets across the network.
Each packet is processed by a separate thread that is envoked by the main thread
listening on
the packet capture handle.
++++++++++++++++
So finally
Could anyone suggest a way on improving the time delay and making the bridge process
packets faster
with improved response time.
Solutions using Packet Capture Library would be great !!
Thanks in advance
Kamal
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