I came across a couple of networking questions for trouble shooting and would like to get some feed back of what you would do in these situations. Lets get started...
- There is a stateful firewall between Host A and Host B. When the firewall allows all the traffic between Host A and Host B, Host A can correctly detect a closed UDP port on Host B, but when the firewall blocks all the traffic between Host A and Host B, Host A falsely indicates that UDP port is open instead of being closed. Why?
- We have a web application being load balanced by a F5 LTM and it’s been working fine for months. Today, users reported that sometimes the page displays an error but after hitting refresh, everything works fine again. It is happening intermittently. What seems to be causing this issue?
- A customer reports that they are experiencing intermittent loss of connectivity across a VPN tunnel – the tunnel is UP and ACTIVE and most of the connectivity works fine; sometimes a few of the hosts in the tunnel are unable to connect to hosts on the other side. How would you troubleshoot?
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