# Few questions... **URL:** \ **Category:** Zeek\ **Created:** [July 25, 2002, 11:03pm UTC](https://community.zeek.org/t/few-questions/268 "2002-07-25T23:03:37Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Vern](https://yyz1.discourse-cdn.com/flex011/user_avatar/community.zeek.org/vern/32/630_2.png) [@Vern](https://community.zeek.org/u/Vern)\ **Post date:** [July 25, 2002, 11:03pm UTC](https://community.zeek.org/t/few-questions/268/1 "2002-07-25T23:03:37Z")
> I could not find any bro mailing list archive. (it's available as a single flat file [:-(] by sending "get bro archive" in the body of a message mailed to majordomo@lbl.gov) > Does bro detects illegal TCP acknowledgements and > retransmissions which i could not see using ordinary > dump utility? Depends what you mean by "illegal". It detects acknowledgments above sequence holes, and inconsistent TCP retransmission. Unfortunately, when looking at a large volume of traffic, these show up due to various things being broken (as mentioned in the Bro paper), so their presence isn't a useful indicator of an attack.     Vern ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/zeek/original/1X/f09d732bc2cc7c7cc7e35db67cf4e1d5233ce7a7.png) [@system](https://community.zeek.org/u/system)\ **Post date:** [May 6, 2022, 3:36pm UTC](https://community.zeek.org/t/few-questions/268/2 "2022-05-06T15:36:33Z")