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881. send, wait and sleep
Next: mode and default Up: A dip Reference Previous: The if and goto . These commands help implement simple chat scripts in dip. send outputs its arguments to the serial line. It does not support variables, but understands all C-style backslash character sequences such as n and b. The tilde character () is used as an abbreviation for carriage return/newline. wait takes a word as an argument, and scans all input on the serial line until it recognizes this word. ...
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Ссылки http://itpm.msu.su/LDP/nag/node104.html -- 2.5 Кб -- 18.04.1999
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882. mode and default
... These commands are used to flip the serial line to SLIP mode and configure the interface. The mode command is the last command executed by dip before gong into daemon mode. ... After enabling SLIP mode on the serial line, dip executes ifconfig to configure the interface as a point-to-point link, and invokes route to set the route to the remote host. If, in addition, the script executes the default command before mode, dip will also make the default route point to the SLIP link. ...
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Ссылки http://itpm.msu.su/LDP/nag/node105.html -- 2.4 Кб -- 18.04.1999
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883. Running in Server Mode
Next: The Point-to-Point Protocol Up: Serial Line IP Previous: mode and default . ... Doing the opposite, namely configuring your host to act as a SLIP server, is much easier. One way to do this is to to use dip in server mode, which can be achieved by invoking it as diplogin. ... If you don't have dip running setuid root, you should make diplogin a separate copy of dip instead of a simple link. diplogin can then safely be made setuid, without affecting the status of dip itself. ...
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Ссылки http://itpm.msu.su/LDP/nag/node106.html -- 4.8 Кб -- 18.04.1999
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884. The Point-to-Point Protocol
Next: Untangling the P's Up: The Network Administrators' Guide Previous: Running in Server Mode . Untangling the P's . PPP on . Running pppd . Using Options Files . ... Debugging Your PPP Setup . IP Configuration Options . ... Routing Through a PPP Link . Link Control Options . ... Authentication with PPP . CHAP versus PAP . The CHAP Secrets File . The PAP Secrets File . Configuring a PPP Server . ...
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Ссылки http://itpm.msu.su/LDP/nag/node107.html -- 2.9 Кб -- 18.04.1999
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885. Untangling the P's
Next: PPP on Up: The Point-to-Point Protocol Previous: The Point-to-Point Protocol . Just like SLIP, PPP is a protocol to send datagrams across a serial connection, but addresses a couple of deficiencies of the former. ... At the very bottom of PPP is the High-Level Data Link Control Protocol, abbreviated HDLC, which defines the boundaries around the individual PPP frames, and provides a 16-bit checksum. ... An important step at the configuration stage of a PPP link is client authorization. ...
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Ссылки http://itpm.msu.su/LDP/nag/node108.html -- 5.4 Кб -- 18.04.1999
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886. PPP on
... On , PPP functionality is split up in two parts, a low-level HDLC driver located in the kernel, and the user space pppd daemon that handles the various control protocols. ... The PPP kernel driver was written by Michael Callahan. pppd was derived from a free PPP implementation for Sun and 386BSD machines, which was written by Drew Perkins and others, and is maintained by Paul Mackerras. ... Just like SLIP, PPP is implemented by means of a special line discipline. ...
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Ссылки http://itpm.msu.su/LDP/nag/node109.html -- 4.1 Кб -- 18.04.1999
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887. The Internet Protocol
... Of course, you wouldn't want your networking to be limited to one Ethernet. ... This connection is handled by a dedicated host, a so-called gateway , which handles incoming and outgoing packets by copying them between the two Ethernets and the fiber optics cable. ... To facilitate things, datagram exchange is governed by a single protocol that is independent of the hardware used: IP, or Internet Protocol . ... This is achieved by assigning each host a unique 32-bit number, called the IP-address . ...
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Ссылки http://itpm.msu.su/LDP/nag/node11.html -- 5.9 Кб -- 18.04.1999
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888. Running pppd
Next: Using Options Files Up: The Point-to-Point Protocol Previous: PPP on . ... After exiting the communications program you used for dialing, you execute the following command: # pppd /dev/cua3 38400 crtscts defaultroute This will flip the serial line cua3 to PPP mode and establish an IP-link to c3po. ... The first thing pppd does after starting up is to negotiate several link characteristics with the remote end, using LCP. ... We will return to LCP in more detail in some later section. ...
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Ссылки http://itpm.msu.su/LDP/nag/node110.html -- 5.0 Кб -- 18.04.1999
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889. Using Options Files
... The first options file is /etc/ppp/options, which is always scanned when pppd starts up. ... It allows each user to specify her own set of default options. A sample /etc/ppp/options file might look like this: # Global options for pppd running on vlager.vbrew.com auth # require authentication usehostname # use local hostname for CHAP lock # use UUCP-style device locking domain vbrew.com # our domain name The first two of these options apply to authentication and will be explained below. ...
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Ссылки http://itpm.msu.su/LDP/nag/node111.html -- 4.1 Кб -- 18.04.1999
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890. Dialing out with chat
... The command to be executed can be given to pppd with the connect command line option. pppd will redirect the command's standard input and output to the serial line. ... Basically, a chat script consists of an alternating sequence of strings that we expect to receive from the remote system, and the answers we are to send. ... This is a typical excerpt from a chat script; ogin: b1ff ssword: s3kr3t This tells chat to wait for the remote system to send the login prompt, and return the login name b1ff. ...
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Ссылки http://itpm.msu.su/LDP/nag/node112.html -- 7.4 Кб -- 18.04.1999
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891. Debugging Your PPP Setup
... By default, pppd will log any warnings and error messages to syslog's daemon facility. ... The following entry sends all messages to /var/log/ppp-log: daemon.* /var/log/ppp-log If your PPP setup doesn't work at once, looking into this log file should give you a first hint of what goes wrong. ... To capture kernel debugging messages, you must either run a syslogd daemon that reads the /proc/kmsg file, or the klogd daemon. Either of them directs kernel debugging to syslog's kernel facility. ...
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Ссылки http://itpm.msu.su/LDP/nag/node113.html -- 3.0 Кб -- 18.04.1999
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892. IP Configuration Options
Next: Choosing IP Addresses Up: The Point-to-Point Protocol Previous: Debugging Your PPP Setup . IPCP is used to negotiate a couple of IP parameters at link configuration time. ... Upon receipt, the remote end inspects each option in turn, and either acknowledges or rejects it. pppd gives you a lot of control about which IPCP options it will try to negotiate. ... Choosing IP Addresses . Routing Through a PPP Link . ... Thu Mar 7 23:22:06 EST 1996 ...
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Ссылки http://itpm.msu.su/LDP/nag/node114.html -- 2.4 Кб -- 18.04.1999
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893. The Network Administrators' Guide
Next: Contents Up: The Network Administrators' Guide . ... UUCP Networks . ... IP Routing . ... Kernel Configuration . Kernel Options in 1.0 and Higher . ... Writing hosts and networks Files . ... Using Options Files . ... The Network File System . ... UUCP Configuration Files . ... Taylor Configuration Files . General Configuration Options-- the config File . How to Tell UUCP about other Systems-- the sys File . ... Mail Routing in the UUCP World . ... Writing the Configuration Files . ...
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Ссылки http://itpm.msu.su/LDP/nag/node1.html -- 23.3 Кб -- 18.04.1999
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894. Other Types of Hardware
Next: The Internet Protocol Up: TCP/IP Networks Previous: Ethernets . In larger installations, such as Groucho Marx University, Ethernet is usually not the only type of equipment used. At Groucho Marx University, each department's LAN is linked to the campus backbone, which is a fiber optics cable running FDDI ( Fiber Distributed Data Interface ). ... For long-distance network links, a different type of equipment is frequently used, which is based on a standard named X.25. ...
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Ссылки http://itpm.msu.su/LDP/nag/node10.html -- 3.4 Кб -- 18.04.1999
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895. The get Command
Next: The print Command Up: A dip Reference Previous: echo and term . The get command is dip's way of setting a variable. ... get $local ask Enter the value for $local: . ... Bizarre as it seems first, this is very useful in some cases: Some SLIP servers will not allow you to use your own IP-address on the SLIP link, but will rather assign you one from a pool of addresses whenever you dial in, printing some message that informs you about the address you have been assigned. ...
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Ссылки http://itpm.msu.su/LDP/nag/node100.html -- 2.6 Кб -- 18.04.1999
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896. The print Command
. Next: Variable Names Up: A dip Reference Previous: The get Command . This is the command to echo text to the console dip was started from. Any of dip's variables may be used in print commands, such as . print Using port $port at speed $speed Using port cua3 at speed 38400 . Andrew Anderson . Thu Mar 7 23:22:06 EST 1996
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Ссылки http://itpm.msu.su/LDP/nag/node101.html -- 1.9 Кб -- 18.04.1999
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897. Variable Names
Next: The if and goto Up: A dip Reference Previous: The print Command . dip only understands a predefined set of variables. A variable name always begins with a dollar symbol and must be written in lower-case letters. The $local and $locip variables contain the local host's name and IP-address. Setting the hostname makes dip store the canonical hostname in $local, at the same time assigning $locip the corresponding IP-address. The analogous thing happens when setting the $locip. ...
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Ссылки http://itpm.msu.su/LDP/nag/node102.html -- 2.6 Кб -- 18.04.1999
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898. The if and goto Commands
... The if command is rather a conditional branch than what one usually calls an if. ... if var op number goto label . ... The second operand must be an integer number; the operator op may be one of == , != , < , > , <= , and >= . The goto command makes the execution of the script continue at the line following that bearing the label. A label must occur as the very first token on the line, and must be followed immediately by a colon. Andrew Anderson . Thu Mar 7 23:22:06 EST 1996 ...
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Ссылки http://itpm.msu.su/LDP/nag/node103.html -- 2.4 Кб -- 18.04.1999
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899. Footnotes
... If it didn't, then DNS would be about as bad as any other method, because each query would involve the root name servers...domain. ... Note that names in networks must not collide with hostnames from the hosts file, else some programs may produce strange results...device . ... To escape this dilemma, you can either make nslookup use a different name server, or you can use the sample file in figure- as a starting point, and then obtain the full list of valid servers.. ... UUCP-1.04, . ...
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Ссылки http://itpm.msu.su/LDP/nag/footnode.html -- 28.4 Кб -- 18.04.1999
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900. About this document ...
Up: Linux Installation and Getting Previous: 6 Networking . Linux Installation and Getting Started . This document was generated using the LaTeX 2 HTML translator Version 96.1-h (September 30, 1996) Copyright ї 1993, 1994, 1995, 1996, Nikos Drakos , Computer Based Learning Unit, University of Leeds. ... The translation was initiated by Clarica Grove on Wed Mar 4 10:46:42 PST 1998 . ... Clarica Grove . Wed Mar 4 10:46:42 PST 1998 ...
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Ссылки http://itpm.msu.su/LDP/install-guide-3.2.html/node9.html -- 2.9 Кб -- 18.04.1999
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