TCP & Transport Calculators

16 free tcp & transport calculators in Networking.

Bandwidth Delay Product CalculatorCompute the bandwidth-delay product: how many bytes are in flight on a link at any instant.
Buffer Size CalculatorSize switch or router buffers using the BDP rule or the Stanford BDP over root-N rule for many flows.
Congestion Window CalculatorModel the AIMD sawtooth: how far cwnd drops on loss and how many round trips recovery takes.
Connection Capacity CalculatorFind how many TCP connections a host can hold and whether memory, ports or the table is the limit.
Connection Timeout CalculatorDerive the RFC 6298 retransmission timeout and the total time TCP spends retrying before it gives up.
Flow Count CalculatorEstimate active flows and flow-cache utilisation from host count, flow rate and average flow duration.
NIC Throughput CalculatorCompare a NIC's line-rate packet ceiling against what its CPU cores can actually process.
Packets Per Second CalculatorConvert a bit rate into packets per second for a given frame size, including preamble and interframe gap.
Queue Depth CalculatorSize an interface queue for a target latency and check the M/M/1 wait time at your utilisation.
Session Capacity CalculatorUse Little's law to turn a new-session rate and session lifetime into a firewall session table size.
Socket Buffer CalculatorSize per-socket send and receive buffers from the BDP, and total the kernel memory a server needs.
SYN Flood Capacity CalculatorSee how fast a SYN flood exhausts the backlog queue and whether SYN cookies are required.
TCP Retransmission CalculatorApply the Mathis equation to see the throughput ceiling packet loss imposes on a single TCP stream.
TCP Slow Start CalculatorTrack how the congestion window doubles each round trip during slow start and when it reaches ssthresh.
TCP Window Size CalculatorSize the TCP receive window for a given bandwidth and RTT, and find the window scale factor it needs.
Traffic Burst CalculatorSize a token bucket: the committed burst size a policer needs to pass a burst without dropping it.