A number of people have been asking for a way to check transaction ID randomness, in addition to source port randomness. OARC's
porttest tool has now been expanded to also report on transaction IDs. To use it, issue a TXT query for the name
txidtest.dns-oarc.net. For example, with dig:
$ dig +short txidtest.dns-oarc.net TXT
"12.160.37.12 is GREAT: 26 queries in 2.7 seconds from 26 txids with std dev 20574.11"
Also note that in conjunction with this enhancement, the scoring critera for
porttest and
txidtest have been changed to match the
web-based port test. The scoring is as follows:
Rating |
Standard Deviation |
Bits of Entropy |
---|
GREAT |
3980 -- 20,000+ |
13.75 -- 16.0 |
GOOD |
296 -- 3980 |
10.0 --13.75 |
POOR |
0 -- 296 |
0 -- 10.0 |