Re: syn flood generated by a postfix transaction

2020-09-16 Thread Gabriele Bulfon
.  :  http://www.sonicle.com Music:  http://www.gabrielebulfon.com Quantum Mechanics :  http://www.cdbaby.com/cd/gabrielebulfon -- Da: Wietse Venema A: Postfix users Data: 11 settembre 2020 2.08.01 CEST Oggetto: Re: syn flood gene

Re: syn flood generated by a postfix transaction

2020-09-10 Thread Wietse Venema
Gabriele Bulfon: > Thanks so much for the deep explanation :) Considering the questions asked, I must keep the conversation at a basic level. > Kernel is illumos, I exclude it can be a bug in the kernel stack. > I will check Postfix config, but I don't think there is any huge > limit as you sugge

Re: syn flood generated by a postfix transaction

2020-09-10 Thread Gabriele Bulfon
--- Da: Wietse Venema A: Postfix users Cc: postfix-users@postfix.org u...@porcupine.org Data: 10 settembre 2020 15.52.39 CEST Oggetto: Re: syn flood generated by a postfix transaction Gabriele Bulfon: Hello, we recently had some situation of full bandwidth usage through our fir

Re: syn flood generated by a postfix transaction

2020-09-10 Thread Wietse Venema
Gabriele Bulfon: > Hello, > we recently had some situation of full bandwidth usage through our > firewall, and by investigation we discovered that this was caused > by a specific mail to a specific destination sent via Postifx 3.1.6. > We found an ACK SYN DUP flood during the problem, many many pac

syn flood generated by a postfix transaction

2020-09-10 Thread Gabriele Bulfon
Hello,   we recently had some situation of full bandwidth usage through our firewall, and by investigation we discovered that this was caused by a specific mail to a specific destination sent via Postifx 3.1.6. We found an ACK SYN DUP flood during the problem, many many packets sent, and this on