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-@(#) README.NIS 1.2 96/02/11 17:24:52
-
-> Problem: I have several [machines] with multiple IP addresses, and
-> when they try to connect to a daemon with tcp wrapper, they are often
-> rejected. I assume this is due to the -DPARANOID option, and depends
-> on which IP address is returned first from the nameserver for a given
-> name. This behavior seems to be random, may depend on ordering in
-> the YP host map?
-
-[Note: the situation described below no longer exists. Presently, my
-internet gateway uses the same IP address on all interfaces. To avoid
-confusion I have removed the old name wzv-gw.win.tue.nl from the DNS. I
-have kept the discussion below for educational reasons].
-
-NIS was not designed to handle multi-homed hosts. With NIS, each
-address should have its own hostname. For example, wzv-gw is my
-gateway. It has two interfaces: one connected to the local ethernet,
-the other to a serial link. In the NIS it is registered as:
-
- 131.155.210.23 wzv-gw-ether
- 131.155.12.78 wzv-gw-slip
-
-In principle, wzv-gw could be the official name of one of these
-interfaces, or it could be an alias for both.
-
-The DNS was designed to handle multi-homed hosts. In the DNS my gateway
-is registered in zone win.tue.nl, with one name that has two A records:
-
- wzv-gw IN A 131.155.210.23
- IN A 131.155.12.78
-
-And of course there are PTR records in zones 210.155.131.in-addr.arpa
-and 12.155.131.in-addr.arpa that point to wzv-gw.win.tue.nl.
-
-This setup does not cause any problems. You can test your name service
-with the two programs below. This is what they say on a local NIS client
-(both client and server running SunOS 4.1.3_U1):
-
- % gethostbyname wzv-gw
- Hostname: wzv-gw.win.tue.nl
- Aliases:
- Addresses: 131.155.210.23 131.155.12.78
-
- % gethostbyaddr 131.155.210.23
- Hostname: wzv-gw-ether
- Aliases:
- Addresses: 131.155.210.23
-
- % gethostbyaddr 131.155.12.78
- Hostname: wzv-gw-slip
- Aliases:
- Addresses: 131.155.12.78
-
-Things seem less confusing when seen by a NIS client in a different
-domain (both client and server running SunOS 4.1.3_U1):
-
- % gethostbyname wzv-gw.win.tue.nl
- Hostname: wzv-gw.win.tue.nl
- Aliases:
- Addresses: 131.155.210.23 131.155.12.78
-
- % gethostbyaddr 131.155.210.23
- Hostname: wzv-gw.win.tue.nl
- Aliases:
- Addresses: 131.155.12.78 131.155.210.23
-
- % gethostbyaddr 131.155.12.78
- Hostname: wzv-gw.win.tue.nl
- Aliases:
- Addresses: 131.155.210.23 131.155.12.78
-
-Alas, Solaris 2.4 still has problems. This is what I get on a Solaris
-2.4 NIS client, with a SunOS 4.1.3_U1 NIS server:
-
- % gethostbyname wzv-gw.win.tue.nl
- Hostname: wzv-gw.win.tue.nl
- Aliases: 131.155.210.23 wzv-gw.win.tue.nl
- Addresses: 131.155.12.78
-
-The tcpd source comes with a workaround for this problem. The
-workaround is ugly and is not part of the programs attached below.
-
-
-#! /bin/sh
-# This is a shell archive. Remove anything before this line, then unpack
-# it by saving it into a file and typing "sh file". To overwrite existing
-# files, type "sh file -c". You can also feed this as standard input via
-# unshar, or by typing "sh <file", e.g.. If this archive is complete, you
-# will see the following message at the end:
-# "End of shell archive."
-# Contents: gethostbyaddr.c gethostbyname.c
-# Wrapped by wietse@wzv on Sun Jan 8 17:08:48 1995
-PATH=/bin:/usr/bin:/usr/ucb ; export PATH
-if test -f gethostbyaddr.c -a "${1}" != "-c" ; then
- echo shar: Will not over-write existing file \"gethostbyaddr.c\"
-else
-echo shar: Extracting \"gethostbyaddr.c\" \(1073 characters\)
-sed "s/^X//" >gethostbyaddr.c <<'END_OF_gethostbyaddr.c'
-X /*
-X * gethostbyaddr tester. compile with:
-X *
-X * cc -o gethostbyaddr gethostbyaddr.c (SunOS 4.x)
-X *
-X * cc -o gethostbyaddr gethostbyaddr.c -lnsl (SunOS 5.x)
-X *
-X * run as: gethostbyaddr address
-X *
-X * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
-X */
-X
-X#include <sys/types.h>
-X#include <sys/socket.h>
-X#include <netinet/in.h>
-X#include <arpa/inet.h>
-X#include <netdb.h>
-X#include <stdio.h>
-X
-Xmain(argc, argv)
-Xint argc;
-Xchar **argv;
-X{
-X struct hostent *hp;
-X long addr;
-X
-X if (argc != 2) {
-X fprintf(stderr, "usage: %s i.p.addres\n", argv[0]);
-X exit(1);
-X }
-X addr = inet_addr(argv[1]);
-X if (hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET)) {
-X printf("Hostname:\t%s\n", hp->h_name);
-X printf("Aliases:\t");
-X while (hp->h_aliases[0])
-X printf("%s ", *hp->h_aliases++);
-X printf("\n");
-X printf("Addresses:\t");
-X while (hp->h_addr_list[0])
-X printf("%s ", inet_ntoa(*(struct in_addr *) * hp->h_addr_list++));
-X printf("\n");
-X exit(0);
-X }
-X fprintf(stderr, "host %s not found\n", argv[1]);
-X exit(1);
-X}
-END_OF_gethostbyaddr.c
-if test 1073 -ne `wc -c <gethostbyaddr.c`; then
- echo shar: \"gethostbyaddr.c\" unpacked with wrong size!
-fi
-# end of overwriting check
-fi
-if test -f gethostbyname.c -a "${1}" != "-c" ; then
- echo shar: Will not over-write existing file \"gethostbyname.c\"
-else
-echo shar: Extracting \"gethostbyname.c\" \(999 characters\)
-sed "s/^X//" >gethostbyname.c <<'END_OF_gethostbyname.c'
-X /*
-X * gethostbyname tester. compile with:
-X *
-X * cc -o gethostbyname gethostbyname.c (SunOS 4.x)
-X *
-X * cc -o gethostbyname gethostbyname.c -lnsl (SunOS 5.x)
-X *
-X * run as: gethostbyname hostname
-X *
-X * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
-X */
-X#include <sys/types.h>
-X#include <sys/socket.h>
-X#include <netinet/in.h>
-X#include <arpa/inet.h>
-X#include <netdb.h>
-X#include <stdio.h>
-X
-Xmain(argc, argv)
-Xint argc;
-Xchar **argv;
-X{
-X struct hostent *hp;
-X
-X if (argc != 2) {
-X fprintf(stderr, "usage: %s hostname\n", argv[0]);
-X exit(1);
-X }
-X if (hp = gethostbyname(argv[1])) {
-X printf("Hostname:\t%s\n", hp->h_name);
-X printf("Aliases:\t");
-X while (hp->h_aliases[0])
-X printf("%s ", *hp->h_aliases++);
-X printf("\n");
-X printf("Addresses:\t");
-X while (hp->h_addr_list[0])
-X printf("%s ", inet_ntoa(*(struct in_addr *) * hp->h_addr_list++));
-X printf("\n");
-X exit(0);
-X } else {
-X fprintf(stderr, "host %s not found\n", argv[1]);
-X exit(1);
-X }
-X}
-END_OF_gethostbyname.c
-if test 999 -ne `wc -c <gethostbyname.c`; then
- echo shar: \"gethostbyname.c\" unpacked with wrong size!
-fi
-# end of overwriting check
-fi
-echo shar: End of shell archive.
-exit 0
generated by cgit v1.2.3 (git 2.39.1) at 2025-06-04 20:42:51 +0000