TCP IP Illustrated

Default is 1 udpttl the default value for the ttl

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: /bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/append_e.htm (2 of 16) [12/09/2001 14.48.06] Appendix E: Configurable Options tcp_keepidle Number of 500-ms clock ticks before sending a keepalive probe. Default value is 14400 (2 hours). tcp_keepintvl Number of 500-ms clock ticks between successive keepalive probes, when no response is received. Default value is 150 (75 seconds). tcp_sendspace The default size of the TCP send buffer. Default value is 4096. tcp_recvspace The default size of the TCP receive buffer. This affects the window size that is offered. Default value is 4096. udpcksum If nonzero, UDP checksums are calculated for outgoing UDP datagrams, and incoming UDP datagrams containing nonzero checksums have their checksum verified. If 0, outgoing UDP datagrams do not contain a checksum, and no checksum verification is performed on incoming UDP datagrams, even if the sender calculated a checksum. Default is 1. udp_ttl The default value for the TTL field in UDP datagrams. Default value is 30. udp_sendspace The default size of the UDP send buffer. Defines the maximum UDP datagram that can be sent. Default is 9216. udp_recvspace The default size of the UDP receive buffer. The default is 41600, allowing for 40 1024-byte datagrams. E.2 SunOS 4.1.3 The method used with SunOS 4.1.3 is similar to what we saw with BSD/386. Since most of the kernel sources are not distributed, all the C variable initializations are contained in a single C source file that is provided. The administrator's kernel configuration file (see the config(8) manual page) can define the following variables. After modifying your configuration file, a new kernel must be made and rebooted. IPFORWARDING The value of this constant initializes the kernel variable ip_forwarding. If -1, IP datagrams are never forwarded. Furthermore, the variable is never changed. If 0 (default), IP datagrams are not forwarded, but the variable's value is changed to 1 if multiple interfaces are up. If 1, forwarding is always e...
View Full Document

This test prep was uploaded on 04/04/2014 for the course ECE EL5373 taught by Professor Guoyang during the Spring '12 term at NYU Poly.

Ask a homework question - tutors are online