Tag Archive
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 [...]
Can You Improve Fault Tolerance with Multiple IP Interfaces on the Same Subnet?
Having two interfaces in a module on the same subnet does not give you two interfaces into and out of the module. While you do get two interfaces into the module, STCP will use just one interface when sending packets out of the module. It does this regardless of which interface a client has connected [...]
Things To Consider on a Multihomed OpenVOS Module
A multihomed system is a system with multiple IP interfaces. These interfaces can be on the same or on different subnets. Today I want to consider protocols like FTP and NDMP. In both protocols the server accepts a connection from the client and then makes a new connection back to the client. On a multihomed [...]
