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Top Forums UNIX for Advanced & Expert Users NIS client will not work through firewall, help please Post 302554185 by hassan1 on Saturday 10th of September 2011 03:21:24 PM
Old 09-10-2011
NIS client will not work through firewall, help please

I have an Ubuntu lucid 10.4 running as NIS client, the machine was working fine as a NIS client until i move the machine to a DMZ firewall.

I tried to get NIS client working through the firewall by I fixing ypbind port to a static port by modifying the file “/etc/default/nis”
YPBINDARGS="-p 835”

The above fixed ypbind port on 835, I then opened port 835 (ypbind) and port 111 portmapper on the firewall.

rpcinfo -p
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100007 2 udp 835 ypbind
100007 1 udp 835 ypbind
100007 2 tcp 835 ypbind
100007 1 tcp 835 ypbind

However when i try to start ypbind daemon, ypbind fail to bind to ypserver

“ypcat passwd” show the following error message

YPBINDPROC_DOMAIN: Domain not bound
No such map passwd.byname. Reason: Can't bind to server which serves this domain

Because I could not ping the NIS server i modified “/etc/default/nis” to

YPBINDARGS="-no-dbus -p 835 -no-ping"

But this did not fix the problem, NIS client is still not binding to ypserver through the firewall.

What other port do i need to open on the firewall?

What am i doing rough? Can you help please?
 

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ypset(1M)						  System Administration Commands						 ypset(1M)

NAME
ypset - point ypbind at a particular server SYNOPSIS
/usr/sbin/ypset [-d ypdomain] [-h host] server DESCRIPTION
In order to run ypset, ypbind must be initiated with the -ypset or -ypsetme options. See ypbind(1M). ypset tells ypbind to get NIS services for the specified ypdomain from the ypserv process running on server. If server is down, or is not running ypserv, this might not be dis- covered until an NIS client process tries to obtain a binding for the domain. At this point, the binding set by ypset is tested by ypbind. If the binding is invalid, ypbind attempts to rebind for the same domain. ypset is useful for binding a client node that is not on a broadcast net, or is on a broadcast net that is not running an NIS server host. It is also useful for debugging NIS client applications, for instance, where an NIS map exists only at a single NIS server host. Where several hosts on the local net are supplying NIS services, ypbind can rebind to another host, even while you attempt to find out if the ypset operation succeeded. For example, if you enter the ypset command below, you might get the subsequent response from ypwhich: example% ypset host1 example% ypwhich host2 The sequence shown above is a function of the NIS subsystem's attempt to load-balance among the available NIS servers, and occurs when host1 does not respond to ypbind because it is not running ypserv (or is overloaded), and host2, running ypserv, obtains the binding. server indicates which NIS server to bind to, and must be specified as a name or an IP address. This works only if the node has a current valid binding for the domain in question and ypbind has been set to allow use of ypset. In most cases, server should be specified as an IP address. ypset tries to bind over a connectionless transport. The NIS library call, yp_all(), uses connection-oriented transport and derives the NIS server's address based on the connectionless address supplied by ypset. Refer to ypfiles(4) for an overview of the NIS name service. OPTIONS
-d ypdomain Use ypdomain, instead of the default domain. -h host Set ypbind's binding on host, instead of locally. Specify host as a name. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnisu | +-----------------------------+-----------------------------+ SEE ALSO
ypwhich(1), ypfiles(4), attributes(5) SunOS 5.10 14 Sep 1992 ypset(1M)
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