[KLUG Members] slow telnet

[Adam Tauno Williams]

>>>what would be causing telnet to take close to three minuets before
>>>showing a login prompt?  once it gives the prompt though there is no
>>>lag in the commands and displays.
>>DNS timeouts.
>>You need to make sure that reverse lookups are working.  Do an "nslookup 
>>{PC's IP address}" on the Linux box and see what happens.  When you connect
>>the Linux box wants to record your host name in a log file.
>I'd suggest putting an entry in /etc/hosts on the linux box of the host
>you want to log in from.  Then when that works worry about seting up DNS with
>reverse lookups.  hosts is great for a single machine.  DNS for the many.
>What I really want to know is how to setup dns to work with the wins
>hook in samba.  Does this parameter then execute a command to add an entry into
>dns everytime an entry is added through wins. 

Or when an entry is removed, yes.  The external command is usually a script that
takes the parameters (as defined in "man smb") feeds the appropriate syntax into
nsupdate (the Bind async-update client).  The Samba package includes and example
script dns_update that does exactly this, and filters out the spurious WINS crap
that doesn't pertain to DNS.  It however only manages forward lookups,  I have
an adam-hacked-special that manages reverse updates too so long as all hosts
live in the same SOA.

>Does anyone have an example of how to set this up? 

Yes.  A DHCP network without WINS HOOK is madness I say, madness!!!

>This means that the machine running dns must run nmbd, correct?

No.  The machine must have the privilages requires to perform and async-update
to the Bind version 8 or greater DNS server.

WINS HOOK (G)
              When  Samba is running as a WINS server this allows
              you to call an external program for all changes  to
              the  WINS database. The primary use for this option
              is to allow the dynamic  update  of  external  name
              resolution databases such as dynamic DNS.
              The  wins  hook  parameter  specifies the name of a
              script or executable that will be  called  as  fol­
              lows:
              wins_hook operation name nametype ttl IP_list
              The  first  argument is the operation and is one of
              "add", "delete", or "refresh". In  most  cases  the
              operation can be ignored as the rest of the parame­
              ters  provide  sufficient  information.  Note  that
              "refresh" may sometimes be called when the name has
              not previously been added, in that case  it  should
              be treated as an add.
              The  second  argument  is  the netbios name. If the
              name is not a legal name then the wins hook is  not
              called.  Legal  names contain only letters, digits,
              hyphens, underscores and periods.
              The third argument is the netbios name type as a  2
              digit hexadecimal number.
              The  fourth  argument is the TTL (time to live) for
              the name in seconds.
              The fifth  and  subsequent  arguments  are  the  IP
              addresses  currently  registered  for that name. If
              this list is empty then the name should be deleted.
              An  example  script that calls the BIND dynamic DNS
              update program "nsupdate" is provided in the  exam­
              ples directory of the Samba source code.


Systems and Network Administrator
Morrison Industries
1825 Monroe Ave NW.
Grand Rapids, MI. 49505