On Wed, Oct 30, 2013 at 09:26:56AM -0400, Roman Gelfand wrote: > Looking at the tcp stream, below, of a smtp conversation, it appears > there is 5 second delay before the actual smtp conversation begins. > Is this normal behavior. If not, any ideas what/where specifically, > in networking, I should be troubleshooting? No change was done to the > server or any other machines on the network. This started happening > all of a sudden. > > 15047 02:57:33.441270000 192.168.0.209 192.168.0.239 TCP 66 54398 > > smtp [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=4 SACK_PERM=1 > 15048 02:57:33.441494000 192.168.0.239 192.168.0.209 TCP 66 smtp > > 54398 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 MSS=1460 SACK_PERM=1 > WS=16 > 15049 02:57:33.441515000 192.168.0.209 192.168.0.239 TCP 54 54398 > > smtp [ACK] Seq=1 Ack=1 Win=65700 Len=0 > 15237 02:57:38.461112000 192.168.0.239 192.168.0.209 SMTP 97 S: 220 > pmx1.mydomain.biz ESMTP Postfix Does this "http://www.seaglass.com/postfix/faq.html#cnctdelay"; help?
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