[dpdk-users] pktgen - IP address randomness
shrivastav.shyam at gmail.com
Tue May 23 07:16:52 CEST 2017
Sometime back I used lua in moongen to continuously generate ip:tcp packets
with random ip src and random tcp src/dst ports. Here is the corresponding
lua script fragment, don't know how much useful it can be with pktgen as I
have not looked at or used pktgen till now but just in case ...
x1 = math.random(1,254);
x2 = math.random(1,254);
x3 = math.random(1,254);
x4 = math.random(1,254);
p1 = math.random(1025,65534);
p2 = math.random(1025,65534);
pkt.ip.src:set(x1*256*256*256 + x2*256*256 + x3*256
On Tue, May 23, 2017 at 5:01 AM, Chris Hall <chris.hall at stackpath.com>
> I Looking to get as much randomness out of src ip’s as possible. Using
> this config in lua…
> pktgen.src_ip('0', 'start',"0.0.0.1");
> pktgen.src_ip('0', 'min', "0.0.0.1");
> pktgen.src_ip('0', 'max', "255.255.255.254");
> pktgen.src_ip('0', 'inc', "126.96.36.199");
> running a packet capture of 5Million packets on the receiving host,
> parsing the pcap file, based on source ip, seems I can only get about 32769
> uniq ip's, (each connected about 150 times).
> As a comparison I used hping3 with --rand-source option (5million packets)
> I can get about 4942744 uniq ip’s.
> Is there a configure option(s) somewhere that could be tuned for more
> randomness or is the above parms just wrong ?
> Thanks much.
> * Chris
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