Tag Archive
TCP Backlog Capture
TCP Backlog capture is an effect that prevents a server application on the Stratus module listening on port X from successfully creating a connection with any client trying to connect to port X. Connections to other ports even from the same clients work fine. The typical solution is to shut down and restart the server [...]
Taking the Scenic Route
Recently I dealt with a site that appeared to be having an issue with the link between their module and one of their Ethernet switches. As a test the system administrator, call him Fred, pinged the switch and since all pings got a reply Fred concluded the problem was elsewhere. The problem with this conclusion [...]
Maximum Transmission Unit (MTU) versus Maximum Segment Size (MSS)
I have noticed some confusion between the Ethernet Maximum Transmission Unit (MTU) and the TCP Maximum Segment Size (MSS), hopefully the following will explain it. If you are still (or are now) confused don’t hesitate to add a comment or send me an E-mail asking for clarification. First, STCP differentiates between TCP segments being sent [...]
A (very) simple log server for VOS
The OpenVOS architecture makes use of several independent systems; the NIO for X25 communication, the fiber channel disk array controllers, UPS for power, the RSN Internet Console Server for RSN over IP and the maintenance network Ethernet switches that allow all these systems to communicate over a private Ethernet/IP network. These systems are monitored by [...]
The amazing appearing/disappearing host routes
Over the last few weeks several people have asked me about routes that mysteriously appear and then disappear. For example route print Default Gateway: 10.10.10.1 Network Address Gateway Address Subnet Mask Redirect Life 172.16.0.0 10.10.10.172 255.255.0.0 Figure 1 – original routing table And then route print Default Gateway: 10.10.10.1 Network Address Gateway Address Subnet Mask [...]
