TCP IP Illustrated

If 0 outgoing udp datagrams do not contain a checksum

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: rivilege and then type: vangogh # sysctl -w nat.inet.ip.ttl=128 The following parameters can be changed. net.inet.ip.forwarding If 0 (default), IP datagrams are not forwarded. If 1, forwarding is enabled. net.inet.ip.redirect If 1 (default), the host will send ICMP redirects when forwarding IP datagrams. If 0, ICMP redirects are not sent. file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/append_e.htm (15 of 16) [12/09/2001 14.48.06] Appendix E: Configurable Options net.inet.ip.tti The default TTL for both TCP and UDP. The default is 64. net.inet.icmp.maskrepi If 0 (default), the host does not respond to ICMP address mask requests. If 1, it does respond. net.inet.udp.checksum If 1 (default), 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. Additionally, numerous variables that we've described earlier in this appendix are scattered among various source files (tcp_keepidle, subnetsarelocal, etc.) and can be modified. file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/append_e.htm (16 of 16) [12/09/2001 14.48.06] Appendix F: Source Code Availability Source Code Availability This book uses many publicly available software packages. This appendix provides additional details on how to obtain this software. The technique used to obtain this software is called anonymous FTP, where FTP is the standard Internet File Transfer Protocol (Chapter 27). Section 27.3 shows an example of anonymous FTP. For a background on Internet resources in general, and specifically anonymous FTP, refer to any of the recently available books on the Internet, such as [LaQuey 1993] or [Krol 1992]. The hosts listed here are believed to be the primary site where the package is available. There may...
View Full Document

Ask a homework question - tutors are online