Linux-Networking Digest #58, Volume #12 Fri, 30 Jul 99 08:13:37 EDT
Contents:
DHCP problems (Linux server, Windows clients) (Lars Marowsky-Bree)
Re: Connecting two remote offices with Linux? ("Jan Johansson")
ipchains in script will not execute (marty)
Re: Samba Client Woes (Josh Miller)
imap and smtp configuration
Re: time limit on pppd (W.G. Unruh)
Re: OOPS! Security Question (W.G. Unruh)
Help: cannot make Linux-Mandrake talk to Win Nt4 ("Jon Phipps")
Linux client with MS Proxy Server 2.0 on NT Server ("Evan Davey")
FTAM (OSI) ("Marcio Lima")
ipchains ("St. Rosik")
networking basics (Yap Chen Kuang)
nis(+) shows wrong map contents (Gerhard Kroder)
Re: 2.2.10, DNS, and module problems (sasala)
Firewall Test? ([EMAIL PROTECTED])
Re: Networking Problem ("Fr�d�ric Bernard")
Kppp help - ([EMAIL PROTECTED])
Re: POP Mail (Frank Waarsenburg)
----------------------------------------------------------------------------
From: [EMAIL PROTECTED] (Lars Marowsky-Bree)
Subject: DHCP problems (Linux server, Windows clients)
Date: 30 Jul 1999 11:48:12 +0100
Good morning,
I am having a very strange problem with one of our clients. We setup up a
Linux dhcpd on RH6, and basically it works fine. Static IP assignments to the
Windows clients are just dandy.
However, dynamic IP assignments don't work (from the range in dhcpd.conf).
Here is a static assignement:
Jul 27 17:20:44 proxy dhcpd: DHCPREQUEST for 192.168.111.77 from
00:20:35:56:e1:c6 via tr0
Jul 27 17:20:44 proxy dhcpd: DHCPACK on 192.168.111.77 to 00:20:35:56:e1:c6
via tr0
Jul 27 17:20:44 proxy dhcpd: DHCPDISCOVER from 00:20:35:56:e1:c6 via tr0
Jul 27 17:20:44 proxy dhcpd: DHCPOFFER on 192.168.111.77 to 00:20:35:56:e1:c6
via tr0
Jul 27 17:20:44 proxy dhcpd: DHCPREQUEST for 192.168.111.77 from
00:20:35:56:e1:c6 via tr0
Jul 27 17:20:44 proxy dhcpd: DHCPACK on 192.168.111.77 to 00:20:35:56:e1:c6
via tr0
Jul 27 17:20:54 proxy dhcpd: DHCPINFORM from 192.168.111.77
A dynamic assignment however looks like this:
Jul 27 17:22:33 proxy dhcpd: DHCPDISCOVER from 00:04:ac:b0:d2:c9 via tr0
Jul 27 17:22:34 proxy dhcpd: DHCPOFFER on 192.168.111.200 to 00:04:ac:b0:d2:c9
via tr0
Jul 27 17:22:34 proxy dhcpd: DHCPREQUEST for 192.168.111.200 from
00:04:ac:b0:d2:c9 via tr0
Jul 27 17:22:34 proxy dhcpd: DHCPACK on 192.168.111.200 to 00:04:ac:b0:d2:c9
via tr0
There never is a DHCPINFORM from the client regarding its IP address. The
clients pop up an "Access denied.".
I am out of guesses, since the same setup works fine in our own office. Only
difference is we are not using token ring, but this shouldn't really affect
this, no?
Clients are Win98 and NT.
The relevant parts from dhcpd.conf:
subnet 192.168.111.0 netmask 255.255.255.0 {
range 192.168.111.200 192.168.111.219;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.111.255;
option routers 192.168.111.2;
option domain-name-servers 192.168.111.2;
option domain-name "foo.com";
}
Reverse and forward DNS for these addresses exists too.
Any hints?
Sincerely,
Lars Marowsky-Br�e
--
Lars Marowsky-Br�e
Network Management
teuto.net Netzdienste GmbH - DPN Verbund-Partner
------------------------------
From: "Jan Johansson" <[EMAIL PROTECTED]>
Subject: Re: Connecting two remote offices with Linux?
Date: Thu, 29 Jul 1999 19:10:04 GMT
> We have two offices that each have a DSL connection. I would need to
> connect them together over the internet. I would like to do this using
> Linux. The two offices need to use the same database (Ms Access), there
> will only be about ten people, at most using the database at one time.
A few questions.
Can the ADSL be "always up", or do you pay for traffic?
Is security an issue?
Do you have "real" IP numbers, or will you use the "private range" (also
called 'dark') IP's?
------------------------------
From: marty <[EMAIL PROTECTED]>
Subject: ipchains in script will not execute
Date: Fri, 30 Jul 1999 07:24:03 GMT
Hiya all, :-)
I have a firewall set up for my office. I start off with:
/sbin/ipchains -P input DENY
/sbin/ipchains -P output DENY
/sbin/ipchains -P forward DENY
Then start allowing only those things that I wish the internal
network to see or access. This takes approximately 100 ipchain
commands to execute. If I enter these commands by hand
they all work, but if I put them in any sort of script file, I get a
whole bunch of errors and statements to use ipchains -h or
ipchains --help for more info.
If a command works by being typed in manually, is there any
reason that it would not work in a simple script? I set the executable
bit, and started the script with #!/bin/sh
In addition, I have tried it in the /etc/rc.d/init.d/network file.
Added it
just before the end and I still get the same error.
Any help would be much appreciated.
Thanks,
Marty.
------------------------------
From: Josh Miller <[EMAIL PROTECTED]>
Crossposted-To: linux.samba
Subject: Re: Samba Client Woes
Date: Fri, 30 Jul 1999 03:51:42 -0400
Try:
smbclient -L computerName
eg: smbclient -L halo
you should get a list of shares. If you need to use a user name:
smbclient -L computerName -u username
then use one of those shares to connect to it ftp style:
smbclient //computerName/share [-u username] [password]
eg: smbclient //halo/privateShare -u polidore
(you can just follow that with the password if you don't want to be
promted for it)
If it has any problems resolving, you can always tell it where that
machine is....
smbclient //halo/privateShare -u polidore -I 10.0.0.23
smbmount is way cooler than smbclient... but I haven't been able to get it
to work just right, I think I broke something there on my machine, so I
won't even try to suggest the right way to use it :-)
Hope that get's ya going.
--
Josh I.
root wrote:
> OK. I've read every piece of documentation out there, but I still
> can't get my linux box to see any hosts on my system that aren't in
> /etc/lmhosts AND I can't make it log in to my NT server which you must
> do on my network before you can use any share. Here is some basic info
> on my system:
>
> -MS NT4 server with 99% windows workstations.. and then there's me with
> Redhat Linux 6.0
> -DHCP
> -No wins server
> -behind a firewall/proxy (shouldn't affect anything, right?)
> -computers represented by 10.1.1.x
> -default gateway 10.1.1.1
> -able to ping any system in local network.
> -unable to ping systems outside the network due to firewall
> -i have DNS addresses in there, but mainly just for my internet??
> -system administrator is an ass who won't help me.
> -the internt works so i know my network card works.
>
> This is how you set up a workstation in windows:
> -TCP/IP network using DHCP, so in windows, I don't set a wins server, a
> dns.. nothing. dhcp does it.
> -Client for microsoft networks logs into an NT domain at boot named
> TELECON
> -File and printer sharing exists
> -Intel ether express 10/100
>
> then you just log in when windows reboots.
>
> This is what I've done so far in Linux:
> -installed samba with basic redhat setup
> -these lines exists in /etc/services:
> netbios-ns 137/tcp # NETBIOS Name Service
> netbios-ns 137/udp
> netbios-dgm 138/tcp # NETBIOS Datagram Service
> netbios-dgm 138/udp
> netbios-ssn 139/tcp # NETBIOS session service
> netbios-ssn 139/udp
>
> -i'm loading smbd and nmbd through inetd.conf. here are the lines:
> #SAMBA services
> netbios-ssn stream tcp nowait root /usr/sbin/smbd smbd
> netbios-ns dgram udp wait root /usr/sbin/nmbd nmbd
>
> -this is my smb.conf
> [global]
>
> security = server
> config file = /etc/smb.conf
> announce as = Win95
> share modes = yes
> encrypt passwords = yes
> smb passwd file = /etc/smbpasswd
> mangle case = yes
> case sensitive = no
> default case = lower
> preserve case = yes
> short preserve case = no
> password level = 0
> preferred master = no
> os level = 0
> null passwords = yes
> dead time = 0
> debug level = 0
> domain master = no
> load printers = no
> password server = TELECON
> comment = Ben
> workgroup = TELECON
> [Root]
> available = yes
> public = yes
> guest only = no
> writable = no
> browseable = yes
> only user = no
> comment = The root dir of my HD.
> path = /
> write list = root
>
> -here are some common error messages:
> smbmount '\\halo\' -U polidore -W TELECON
> Password:
> SMBtconX failed. ERRDOS - ERRnosuchshare
> Perhaps you are using the wrong sharename, username or password?
> Some servers insist that these be in uppercase
>
> BUT halo is in my lmhosts file. This is what happens when I use one
> that's not:
> smbmount '\\robert\' -U polidore -W TELECON
>
> cli_open_sockets: Unknown host ROBERT.
>
> This is what happens when I try to log in to my NT server with
> smbpasswd:
> smbpasswd -j TELECON
> modify_trust_password: Can't resolve address for TELECON
> 1999/07/27 11:20:08 : change_trust_account_password: Failed to change
> password for domain TELECON.
>
> Can someone please help me. I've been working on this for 2 days, and
> I'm at my wit's end. Also, please send me a cc: of your replies.
>
> Thanks in advance,
> Ben Polidore
> [EMAIL PROTECTED]
------------------------------
From: <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.setup,redhat.config
Subject: imap and smtp configuration
Date: 30 Jul 1999 07:30:31 GMT
how to setup the imap / smtp lookup directory if my default directory for
the client is in ~/mail/mail (mail is a file, is it ok ?)
i'm using qmail btw.
thank you in advance.
================== Posted via SearchLinux ==================
http://www.searchlinux.com
------------------------------
From: [EMAIL PROTECTED] (W.G. Unruh)
Subject: Re: time limit on pppd
Date: 30 Jul 99 09:34:19 GMT
Ahmet Gokalp Ergec <[EMAIL PROTECTED]> writes:
>I configured our machine as a pppd server at last. Now I want to learn
>how can I apply time limit for users who logged on server by pppd. ( 10
>minutes is OK).
The idle option to pppd (man pppd) may help. However, the link must be idle for
the full time for it to work. If you want an absolute time limit (ie that the users
are to be connected for no more than 10 min total) then you have to write a script
which starts when pppd starts, and which shuts down pppdafter 10 min
eg, write the script
/etc/ppp/ppptimer
******************
#!/bin/sh
sleep 600
killall pppd
********************
and put
/etc/ppp/ppptimer &
into the file
/etc/ppp/ip-up.local
you might want to put a line
killall ppptimer
into /etc/ip-down.local as well so that that ppptimer script does not kill a
second ppp which was started after the first one closed before the 10 min was up.
------------------------------
From: [EMAIL PROTECTED] (W.G. Unruh)
Subject: Re: OOPS! Security Question
Date: 30 Jul 99 09:53:54 GMT
The very first thing you should do it to make sure tht your system is up
to date re the security patches. These unclosed holes are the primary way
attackers get in. (eg if you have redhat, go to www.redhat.com ->services ->updates
and download the updates for your system.)
Then, get your users to use ssh or srp to log in (telnet, ftp) so that your
internet cannot be snooped for passwords.
The go through /etc/inetd.conf, and comment out any services youdo not need.
Also set /etc/hosts.deny and /etc/hosts.allow so as to allow access for the
various services only from machines you trust. (eg, rlogin should only be
allowed from your local network, not from anywhere in the world, rexec should
not be allowed at all, etc)
Then mountd and nfsd shhould not be run at all unless your machine is actually
allowing its partitions to be mounted.
"Nathan T. Lager" <[EMAIL PROTECTED]> writes:
>Ok, for the past 2-3 months ive been running a linux box connected to a
>500k cable modem. its a lot of fun for me concidering i am a
>PC-Networking student at the moment. Like i said it was up for about 3
>months and suddenly someone decided to crack into my system (i assume).
>All i know is that suddenly i cant log into my own system, even as root
>from the console! from what i can tell somehow my passwd file got
>deleted. i intend to fix the system and get it back online but for now
>(before i get it back up and vulnerable) id like to find out anything i
>can about how to make it more secure. all i want it to do (for now) is
>serve Telnet, FTP, HTTP, POP3, and SMTP. I run RedHat 5.2 with a Cable
>connection to the 'net and a 5 computer network also connected to this
>system. I would also like to "Eventually" set the linux box as a router
>so that i can route packets from my LAN over the internet but "Hide" the
>LAN behind the Linux Box. Thanx in advance for any help.
------------------------------
From: "Jon Phipps" <[EMAIL PROTECTED]>
Subject: Help: cannot make Linux-Mandrake talk to Win Nt4
Date: Fri, 30 Jul 1999 10:35:25 GMT
This is a multi-part message in MIME format.
=======_NextPart_000_0008_01BED9FE.48D0B2F0
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charset="iso-8859-1"
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The subject just about sums up the problem. We have 2 machines=20
1) pr233 running nt4 with cablemodem access through a hub
2) 486 DX2 running Linux-mandrake
both machines have full internet access but the linux box cannot see the =
NT4 box across the lan. I was wondering what magic is required=20
to make the linux and NT boxes talk to each other. =20
<--------------------------------------------------------->
Regards
Jon Phipps
J+K Computers
Nanaimo
BC
Canada
Home of Configuring NT4 Server for the @home network
Visit us on the web at: http://jkcompu.dynip.com
<--------------------------------------------------------->=20
=20
=======_NextPart_000_0008_01BED9FE.48D0B2F0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META content=3D"MSHTML 5.00.2314.1000" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#a6caf0>
<DIV><FONT face=3DArial size=3D2>The subject just about sums up the =
problem. We have=20
2 machines </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>1) pr233 running nt4 with cablemodem =
access through=20
a hub</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>2) 486 DX2 running =
Linux-mandrake</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>both machines have full internet =
access but=20
the linux box cannot see the NT4 box across the lan. I was wondering =
what magic=20
is required </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>to make the linux and NT boxes talk to =
each=20
other.</FONT> </DIV>
<DIV><PRE><---------------------------------------------------------&g=
t;
Regards
<A href=3D"mailto:[EMAIL PROTECTED]">Jon Phipps</A>
<A href=3D"mailto:[EMAIL PROTECTED]">J+K Computers</A>
Nanaimo
BC
Canada
Home of <A =
href=3D"ftp://jkcompu.dynip.com/pub/Win_NT4/NT_Config_5.00.zip">Configuri=
ng NT4 Server for the @home network</A>
Visit us on the web at: <A =
href=3D"http://jkcompu.dynip.com">http://jkcompu.dynip.com</A>
<--------------------------------------------------------->=20
=20
</PRE></DIV></BODY></HTML>
=======_NextPart_000_0008_01BED9FE.48D0B2F0==
------------------------------
From: "Evan Davey" <[EMAIL PROTECTED]>
Subject: Linux client with MS Proxy Server 2.0 on NT Server
Date: Fri, 30 Jul 1999 18:18:59 +1000
Howdy,
I have just set up RedHat 6.0, and want to run it as my main operating
system. On my local intranet I am running MS Proxy Server 2.0 on NT Server,
and in my current Win98 system I have the WSP (winsock proxy) Client
installed for all winsock requests (so it makes the internet seemless in
windows). How do I access the proxy server in Linux? Is no WSP Client
equivalent for linux? Is there another way of setting up linux so it can
use the proxy server? Otherwise i am restricted to the local intranet which
just ain't good enough... :-) I know the obvious answer would be to replace
NT Server with linux, but I am trying to take linux one step at a time (i am
relatively new to it)...
Any help would be greatly appreciated... And may i just say, LINUX RULES
:-)
EvanD
[EMAIL PROTECTED]
------------------------------
From: "Marcio Lima" <[EMAIL PROTECTED]>
Subject: FTAM (OSI)
Date: Fri, 30 Jul 1999 04:46:19 -0400
Reply-To: "Marcio Lima" <[EMAIL PROTECTED]>
Does anybody knows a OSI FTAM (File Transfer) which runs in a Linux Server ?
Thanks,
Marcio Lima
[EMAIL PROTECTED]
------------------------------
From: "St. Rosik" <[EMAIL PROTECTED]>
Subject: ipchains
Date: Fri, 30 Jul 1999 12:06:47 +0200
Hi,
is there a GUI aviable to configure ipchains?
I used ipfwadm before and the migration is not that easy :-()
regards
Stefan
--
Stefan Rosik
Bremen Briteline
[EMAIL PROTECTED]
- - - - - - - - - - - - - -
don't tell people how to build a ship, tell them about the
passion of the sea
------------------------------
From: Yap Chen Kuang <[EMAIL PROTECTED]>
Subject: networking basics
Date: Sun, 25 Jul 1999 23:40:23 +0800
Has anyone written a HOWTO on how to set up linux as a fileserver?
I've read some networking HOWTOS but after you get a network card and
get it
detected then what?
------------------------------
From: Gerhard Kroder <[EMAIL PROTECTED]>
Subject: nis(+) shows wrong map contents
Date: Fri, 30 Jul 1999 13:04:31 +0200
hi,
i try to setup automount for linux using solaris-nis+ maps. i need to adopt
them to work with linux automounter. but my problem for now is, that
auto-maps on sunserver are different than what i can see from linux:
>linux > ypcat auto.master
>auto_direct
>auto_home
>-hosts -nosuid
and on master server from solaris i get:
>solaris > niscat auto_master.org_dir
>/- auto_direct
>/home auto_home
>/net -hosts -nosuid
actually nis+ works here since long time without problems. what makes me
wonder is auto.master shows parts of auto_master. that translation of "_"
to "." should be a bug? and first column of auto_master gets lost! i'm
shure ther's no oter nisserver in our local net where i could fetch wrong
maps. and these entries are not present at linuxes auto.master map.
any ideas?
gerhard
--
some infos:
Package: nis
Version: 3.3.3-1
-- System Information
Debian Release: potato
Kernel Version: Linux stardust 2.2.10 #2 Wed Jul 14 15:41:43 CEST 1999 i686
unknown
Versions of the packages nis depends on:
ii libc6 2.1.1-13 GNU C Library: Shared libraries and
timezone
ii libgdbmg1 1.7.3-26.2 GNU dbm database routines (runtime
version).
ii make 3.77-7 The GNU version of the "make" utility.
ii netbase 3.15-4 Basic TCP/IP networking binaries
------------------------------
From: sasala <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.setup
Subject: Re: 2.2.10, DNS, and module problems
Date: Fri, 30 Jul 1999 03:12:38 -0800
Yes, indeed, that is the problem. After many
hours of futzing around with things last night, I
managed to find what was causing the problem.
The file /etc/sysconfig/network-scripts/ifup-aliases is
the root of all my evil. However, I have looked at the
file and ifup-post and really don't understand why it
is causing the problem. It's trying to execute files
of the form 'ifcfg-$1:*', but I don't have anything
in the directory of that form. I know ifcfg-lo,
ifcfg-eth0, and ifcfg-eth1 are there, but there is no
colon to match the '*'. This this a bug of some sort?
-Tom
--
On Thu, 29 Jul 1999 12:40:52 GMT, Thomas M. Sasala wrote:
To all:
I recently upgraded to 2.2.10 from RH6.0
(2.2.5-??). In the process I compiled the kernel with
direct support of my two ethernet cards
instead of using modules. Ever since then
I have been getting error messages in the syslog
about can't find module. Something like:
mod_probe: can't locate module lo:0
mod_probe: can't locate module lo:1
....
mod_probe: can't locate module lo:49
This is caused by IP aliasing. I disable this by commenting
the ifup-aliases line inside my
/etc/sysconfig/network-script/ifup-post file.
* Sent from RemarQ http://www.remarq.com The Internet's Discussion Network *
The fastest and easiest way to search and participate in Usenet - Free!
------------------------------
From: [EMAIL PROTECTED]
Subject: Firewall Test?
Date: Fri, 30 Jul 1999 11:25:01 GMT
Think I've got it working!! Is there a way I can test the
integrity? How does one know the firewall is truly functional?
------------------------------
From: "Fr�d�ric Bernard" <[EMAIL PROTECTED]>
Subject: Re: Networking Problem
Date: Fri, 30 Jul 1999 13:13:52 +0200
Hi !
DIdi you found a solution for you pinging problem ? I still have the same
problem.. I tested with Three differents card, and even if recognized, the
pinging goes out (because of HUB light showing the traffic, but no NT
station answers...)
Seems that we are a couple of peoples having the same problem.. Could it be
a lack on W95/NT tcp-ip configuration ? (like "IP area" in TCP-IP
options...??? I still have no solutions..)
Hope you 'll find something.
Good luck..
PS: please keep me informed of your results !!
------------------------------
From: [EMAIL PROTECTED]
Crossposted-To: comp.os.linux.setup
Subject: Kppp help -
Date: Fri, 30 Jul 1999 11:29:44 GMT
Need help with routing setup (I think) - I can connect, but usually
takes 2-3 tries to get it all right. Sometimes there is no thru-put at
all, sometimes can access pages at my ISP only, and when it's all
correct - I get full access to the outside world.
Appears to be a problem with the address assigned at log-on. I'm
running a small network on eth0 and access the ISP with ttys0.
------------------------------
From: Frank Waarsenburg <[EMAIL PROTECTED]>
Subject: Re: POP Mail
Date: Fri, 30 Jul 1999 13:29:42 +0200
I may miss something here , but I think it's not going to work that way. He's
referring to POP mail. That means that the ISP creates a mailbox for you, which
has YOUR name. Mail is fetched by connecting to port 110 (POP3 protocol) and
you have to identify yourself with userid/password. So, if multiple users want
to use the same connection, you will need multiple POP accounts and most ISP's
charge you for that. This differs from the case where you own a domain. In that
case, your domain is delegated to you, and you will not use POP mail but SMTP
or UUCP. Your users can than pick up mail from your Linux machine, with POP
mail.
There are a couple of ways of solving this question:
1) Ask your ISP to set up multiple POP accounts. Some ISP's do this for free,
some charge you for that.
2) Registrate your own domain. Usually, this is relatively expensive for what
you want, unless your "users" are willing to share the costs..
3) Find a provider which gives a domain for free. In the netherlands and UK,
Demon does that. So, if your name is smith, your domain will be smith.demon.uk
This enables you to setup as much accounts in the domain as you like
([EMAIL PROTECTED] for example)
Hope this helps.
Frank
"D.Krivitsky" wrote:
> D.Krivitsky ����� � ��������� <[EMAIL PROTECTED]> ...
> >>I use Linux as an ip masq solution at home. I'd like to do that for him,
> >but
> >>i've got some questions. He has ONE pop account and his ISP forwards all
> >mail
> >>to his domain to that account. (Example: if his domain is xyz.com, mail
> >sent
> >>to [EMAIL PROTECTED] will go to that one pop account.) Is it possible to
> >split
> >>up that one pop email account into several different ones upon reciept of
> >the
> >>email, or is he SOL and will have to get more accounts.
> >
> >
> >You may try fetching all mail by /usr/bin/fetchmail and then process it by
> >/usr/bin/formail
> >to split it.
>
> ... or even just pass it to sendmail for further delivery, after receiving
> it by fetchmail.
------------------------------
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End of Linux-Networking Digest
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