Slightly over 5 seconds later another request: Source: 10.3.1.171 Dst: 10.3.1.166 Proto: DNS Info: Standard query AAAA Over 2 seconds later another request (after timeout?): Source: 10.3.1.171 Dst: 10.3.1.166 Proto: DNS Info: Standard query AAAA .edu 0002 seconds later another request: Source: 10.3.1.171 Dst: 10.3.1.166 Proto: DNS Info: Standard query AAAA .edu 002 second later the reply: Source: 10.3.1.166 Dst: 10.3.1.171 Proto: DNS Info: Standard query response I have a single DNS server listed in nf, 10.3.1.166. Note: In this scenario I was attempting to connect from 10.3.1.171 to. When I enter the telnet command to connect to port 80 on the second machine I see the following exchange. I can't explain the output, but it is consistent between multiple DNS servers. I've taken some packet dumps using tcpdump and am viewing my findings in Wireshark. SSH exhibits the same symptoms, after about a 10 second delay in connecting the connection is fast. After about a 10 second delay a connection is established, entering GET / returns HTML very quickly. At a prompt I attempt to telnet to port 80 on the other box. I've suspected DNS, but both forward and reverse lookups using dig are extremely fast.Īs a test I've been attempting to test a web connection between two Linux servers. I'm in the process of troubleshooting an issue which is causing some slowness in establishing connections between our Linux servers.
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January 2023
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