$cat /proc/sys/net/ipv4/tcp_max_orphans 8192 $ tcp_max_orphans The tcp_max_orphans variable tells the kernel how many TCP sockets that are not attached to any user file handle to maintain. In case this number is exceeded, orphaned connections are immediately reset and a warning is printed. The only reason for this limit to exist is to prevent some simple …
Monthly Archives: June 2010
tcp latency….throughput..
$cat /proc/sys/net/ipv4/tcp_low_latency 0 $ tcp_low_latency – BOOLEAN If set, the TCP stack makes decisions that prefer lower latency as opposed to higher throughput. By default, this option is not set meaning that higher throughput is preferred. An example of an application where this default should be changed would be a Beowulf compute cluster. Default: 0 …
the interval between the last data packet sent and…
$cat /proc/sys/net/ipv4/tcp_keepalive_time 7200 $ tcp_keepalive_time the interval between the last data packet sent (simple ACKs are not considered data) and the first keepalive probe; after the connection is marked to need keepalive, this counter is not used any further source :http://tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html linux/net/ipv4/tcp.c – 8 identical 365: * TCP Keep-Alives (4.2.3.6) 366: * MAY provide keep-alives. …
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About software port and related to service type micromuse-lm
ABOUT SOFTWARE PORT A Software Port (usually just called a ‘port’) is a virtual data connection that can be used by programs to exchange data directly, instead of going through a file or other temporary storage location. The most common of these are TCP and UDP ports which are used to exchange data between computers …
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wireshark and micromuse-lm
Frame 74388 (60 bytes on wire, 60 bytes captured) Ethernet II, Src: Netgear_b4:91:1a (00:1f:33:b4:91:1a), Dst: Giga-Byt_f2:71:b6 (00:1a:4d:f2:71:b6) Internet Protocol, Src: 209.85.231.100 (209.85.231.100), Dst: 10.0.0.2 (10.0.0.2) Transmission Control Protocol, Src Port: http (80), Dst Port: micromuse-lm (1534), Seq: 3405, Ack: 4005, Len: 0 Source port: http (80) Destination port: micromuse-lm (1534) Stream index: 222 Sequence number: …
grep … -x .. exact line match only
$cat example.txt A for Apple. B for Baby. C for Cat. D for Donkey. $grep A example.txt A for Apple. $grep -x A example.txt $grep -x A for Apple. example.txt grep: for: No such file or directory grep: Apple.: No such file or directory $grep -x “A for Apple.” example.txt A for Apple. $grep -x …
tcp keepalive interval
$cat /proc/sys/net/ipv4/tcp_keepalive_intvl 75 $ tcp_keepalive_intvl the interval between subsequential keepalive probes, regardless of what the connection has exchanged in the meantime linux/net/ipv4/tcp.c – 8 identical 368: * MUST default to no keep-alives. (does) 369: * MUST make keep-alive interval configurable. (does) 370: * MUST make default keep-alive interval > 2 hours. (does) tcp_timer.c – 3 …
What is tcp_keepalive_probes ?
tcp_keepalive_probes the number of unacknowledged probes to send before considering the connection dead and notifying the application layer source : www.tldp.org $cat /proc/sys/net/ipv4/tcp_keepalive_probes 9 $ trunk/os/ip/tcp.c – 7 identical 2436: /* Compute usable segment based on offered window and limit 2437: * window probes to one 2438: */ 3064: return tcphangup(c); 30100: if(n >= 1 …
number of unacknowledged probes TCP
tcp_keepalive_probes the number of unacknowledged probes to send before considering the connection dead and notifying the application layer source : www.tldp.org $cat /proc/sys/net/ipv4/tcp_keepalive_probes 9 $ trunk/os/ip/tcp.c – 7 identical 2436: /* Compute usable segment based on offered window and limit 2437: * window probes to one 2438: */ 3064: return tcphangup(c); 3065: if(n >= 1 …
F-RTO response
$cat /proc/sys/net/ipv4/tcp_frto_response 0 $ When F-RTO has detected that a TCP retransmission timeout was spurious (i.e, the timeout would have been avoided had TCP set a longer retransmission timeout), TCP has several options what to do next. Possible values are: 0 Rate halving based; a smooth and conservative response, results in halved cwnd and ssthresh …