Linux-Networking Digest #976, Volume #10 Tue, 27 Apr 99 23:13:37 EDT
Contents:
can logon to isp, but cannot ping etc (Neil Nadin)
ICMP pingflood (razoon)
Re: 2 IPs 2 Subnets 1 Nic Is It Possible? ([EMAIL PROTECTED])
Re: Changing Telnet Ports? ([EMAIL PROTECTED])
Re: User list not available from Samba (Adam Haeder)
Re: Eicon DIVA under Linux? (Martin van Roon)
Re: ttyp0 and ttyp1 taken from me. ([EMAIL PROTECTED])
PPPD & PAP (William)
Re: FTP Win98 <==> Linux (Darryl L. Pierce)
Re: @home anyone? is it worthwhile or not? ([EMAIL PROTECTED])
Re: socket leak on alpha. ([EMAIL PROTECTED])
3c59x : unresolved symbol(s) problem in linux v2.2.6 ("news")
Re: Linux client, NT server, and callback problems... (Diederick van Dijk)
Re: Telnet taking ages before allowing login ("Tad")
Using tcpdump to monitor loopback ports (Gregory C. Larkin)
Re: Need help setting up a remote X-term. (Lew Pitcher)
----------------------------------------------------------------------------
From: remove Q [EMAIL PROTECTED] (Neil Nadin)
Subject: can logon to isp, but cannot ping etc
Date: Tue, 27 Apr 1999 20:18:00 GMT
Help!
I have loaded Linux onto a Compaq 386 with 8mb Ram with an external
modem US Robotics 14400.
I can connect to my isp, but am unable to get a ping back. I have
telephoned them, and I should get a ping back.
It has taken me ages to get this far but I cannot make any further
progress help would be appreciated. I have included copies of files
that I am using. Where it says 'mypassword' I have used my actual
isp password, for 'mylogin' I have used my real login name.
I am logged in as root.
I connect with:
/usr/sbin/pppd /dev/ttyS1 57600 debug user mylogin connect
"usr/sbin/chat -v '' AT ATD'isp phone no' CONNECT '' ogin: mylogin
assword: mypassword "
Before I connect route -n gives:
Destination Gateway Genmask Flags Metric Ref Use Iface
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0
0 lo
After connection route -n gives:
Destination Gateway Genmask Flags Metric Ref Use Iface
195.112.4.2 0.0.0.0 255.255.255.255 UH 0 0
1 ppp0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0
0 lo
0.0.0.0 195.112.4.2 0.0.0.0 UG 0 0
2 ppp0
/etc/ppp/options
lock
crtscts
defaultroute
/etc/ppp/pap-secrets
mylogin * mypassword *
a listing for a connection from var/log/ppp
(all have a prefix of date, time localhost)
pppd[450]: pppd 2.2.0 started by root, uid 0
chat[453]: send (at^M)
chat[453]: expect (OK)
chat[453]: AT^M^M
chat[453]: OK -- got it
chat[453]: send (ATDmy isp's phone no^M)
chat[453]: expect (CONNECT)
chat[453]: ^M
chat[453]: ATDmyisps phone number^M^M
chat[453]: CONNECT -- got it
chat[453]: send (^M)
chat[453]: expect (ogin: )
chat[453]: 14400/ARQ/V32/LAPM/V42BIS^M
chat[453]: Welcome to Nildram!^M
chat[453]: ^M
last message repeated 2 times
chat[453]: usr1 login: -- got it
chat[453]: send (mylogin^M)
pppd[450]: serial connection established.
chat[453]: expect (assword: )
chat[453]: mylogin^M
chat[453]: Password: -- got it
chat[453]: send (mypassword^M)
pppd[450]: Using interface ppp0
pppd[450]: Connect: ppp0 <--> /dev/ttyS1
pppd[450]: sent [LCP ConfReq id=0x1 <mru 1500> <magic 0xe8fb11d1>
<pcomp> <accomp>]
pppd[450]: rcvd [LCP ConfAck id=0x1 <mru 1500> <magic 0xe8fb11d1>
<pcomp> <accomp>]
pppd[450]: rcvd [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x51ae0e13>
<pcomp> <accomp>]
pppd[450]: sent [LCP ConfAck id=0x2 <asyncmap 0x0> <magic 0x51ae0e13>
<pcomp> <accomp>]
pppd[450]: sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <compress VJ 0f
01>]
pppd[450]: rcvd [IPCP ConfReq id=0x1 <compress VJ 0f 00> <addr
195.112.4.2>]
pppd[450]: sent [IPCP ConfAck id=0x1 <compress VJ 0f 00> <addr
195.112.4.2>]
pppd[450]: rcvd [IPCP ConfNak id=0x1 <addr 195.112.46.96>]
pppd[450]: sent [IPCP ConfReq id=0x2 <addr 195.112.46.96> <compress VJ
0f 01>]
pppd[450]: rcvd [IPCP ConfAck id=0x2 <addr 195.112.46.96> <compress VJ
0f 01>]
pppd[450]: local IP address 195.112.46.96
pppd[450]: remote IP address 195.112.4.2
(some 20 minutes later)
pppd[450]: Hangup (SIGHUP)
pppd[450]: Modem hangup
pppd[450]: Connection terminated.
pppd[450]; Exit.
When I ping an address, I get the output similar to the following,
when I 'Control C'
-- 195.112.4.4 ping statistics --
9 packets transmitted, 0 packets received, 100% packet loss
I thank W.G. Unruh for his 'How to hook up PPP in Linux' at
axion.physics.ubc.ca that has allowed me to get this far.
------------------------------
From: [EMAIL PROTECTED] (razoon)
Subject: ICMP pingflood
Date: Tue, 27 Apr 1999 20:34:36 GMT
Reply-To: [EMAIL PROTECTED]
I use a linuxbox on a cablemodem as gateway for W98 clients.
How can i protect myself against an ICMP pingflood.
I use ipchains
------------------------------
From: [EMAIL PROTECTED]
Subject: Re: 2 IPs 2 Subnets 1 Nic Is It Possible?
Date: Tue, 27 Apr 1999 20:35:15 GMT
In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] (Luca Filipozzi) wrote:
> Change the lease time to
> something reasonable, like 1 or 2 days. Done.
The only reasonable lease time for DHCP is near-infinite. Dynamic IP's are a
bad bad bad bad bad bad bad thing. Did I mention they're bad?
> This solution has the big benefit that at the end of the process you will
> have a DHCP managed ip address pool, which is, IMHO, much better than
> static addresses (if only so that you can change the nameserver, default
> route, etc. in only place only).
There is a difference between "static" and "hardcoded", and I'll assume you
really meant the latter. Static IP addresses are *always* preferable to
dynamic, _especially_ when you're talking about ones in private IP blocks
[for which there is absolutely no reason whatsoever to use dynamic IP
allocation]. You can still use DHCP [which has convenient features for
network administration] to hand out static information, just set the lease
time to something ridiculously huge [and make every effort to insure that
machines never undergo a 'spontaneous' renumbering -- which will hose your
DNS and result in other nastiness such as invalidation of logging records on
proxy servers, gateways, mail servers, etc.].
-Bill Clark
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------------------------------
From: [EMAIL PROTECTED]
Subject: Re: Changing Telnet Ports?
Date: Tue, 27 Apr 1999 20:44:33 GMT
In article <7g4d0u$lmk$[EMAIL PROTECTED]>,
[EMAIL PROTECTED] wrote:
> I currently run redhat 5.1 and have telnet disabled in /etc/inetd.conf.
You mean you have telnetd disabled in /etc/inetd.conf, or have telnet closed.
> When connecting remotely I use ssh.
Good show!
> I now run an icecast server, and for admistration of the server it uses telnet
> to port 8002. I'd like to enable telnet to use 8002 and disable 23.
This is why I was being anal about terminology above -- your statement is
ambiguous. Do you mean administration is done by running `telnet` and going
to port 8002, or that `telnetd` needs to be listening to 8002? I really
suspect you mean the former, and in that case you don't need to run `telnetd`
at all. If you really do need `telnetd` listening on port 8002, the folling
portion of the man page for `telnetd` might be enlightening:
The -debug option may be used to start up telnetd manually, instead
of through inetd(8). If started up this way, port may be specified
to run telnetd on an alternate TCP port number.
Type `man telnetd` to get the full text.
> Telnet is really only a security risk on this machine if it's on 23.
`telnetd` is a security risk no matter what port it listens to. The reason it
is a security risk in the first place is because it requires that passwords be
sent unencrypted over a [potentially] insecure line. It doesn't matter what
port you run `telnetd` on -- packet sniffers will catch all the passwords you
type anyway.
> How do I go about changing that? Is it simply a
> matter of modifying /etc/services to reflect the new port number,
> rereading /etc/inetd.conf and starting the server? Or is there something I'm
> missing.
Again, `man` is your friend.
> I'd appreciate any assistance.
HTH.
-Bill Clark
Systems Architect
ISP Channel
http://locale.ispchannel.com/
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------------------------------
From: Adam Haeder <[EMAIL PROTECTED]>
Subject: Re: User list not available from Samba
Date: Tue, 27 Apr 1999 16:02:07 -0500
As far as I know, Samba is not able to allow Windows machines to
authenticate shares through the "user level" sharing level. I know that
it doesn't work in the version of Samba that you are using (1.9
somthing). Maybe they're working on this functionality. You'll have to
change to share level access control.
--
Adam Haeder
Technical Coordinator, AIM Institute
(402) 345-5025 x115
[EMAIL PROTECTED]
------------------------------
From: Martin van Roon <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.hardware
Subject: Re: Eicon DIVA under Linux?
Date: Tue, 27 Apr 1999 21:05:03 +0000
Steen Suder wrote:
>
> A friend of mine just bought an Eicon DIVA ISDN 2.01 PCI, which he'd
> like to use under Linux.
> As far as I can tell from the documentation in the kernelsource (Linux
> 2.2.6), the Diva ISDN 2.0 PCI is supported. How about the 2.01?
>
> The main difference is that the 2.0 is jumper configured and the 2.01 is
> software configured.
>
> --
> Best regards / Mvh.,
> Steen Suder
> sysadm kollegie6400.dk
> GNU - makes me feel better! Ehhh, Linux is GNU, right...?
Works for me without a problem.
Martin
------------------------------
From: [EMAIL PROTECTED]
Subject: Re: ttyp0 and ttyp1 taken from me.
Date: Tue, 27 Apr 1999 20:55:26 GMT
In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] (Pekka Savola) wrote:
> There is no need for this; logging on as root should be discouraged.
Grrrr.. this myth drives me crazy.
> Log in with your normal user account and use 'su' to gain exactly same
> priviledges as root.
...and advertise your root password to hackers on your system. `su` is a
horrible, outdated, non-secure way to get root. Anyone who can hack your
regular user account can get root access by creating a fake `su` script [which
conveniently deletes itself after running] and placing that into your path.
Unless you're so paranoid that you check your path every time you log in, the
next time you try to `su` you'll provide the hacker with your root password.
The reason everyone says that logging in as root should be discouraged stems
from the days before ssh. Back then, it was a bad idea to log in as root
remotely because passwords were sent unencrypted over the wire. At the
console, you should *always* log in as root, and that's the way it's always
been [although until very recently, vanishingly few people had access to unix
consoles]. Now that ssh is easy to get and run, the most secure possible way
for you to log into a machine remotely is to ssh straight in as root. If you
want to get *really* secure, set up RSARhostsAuthentication [and the
appropriate .shosts file for root] and never type a password again.
Yes, this is pretty much the exact opposite of what you've probably been told
by every old-school sysadmin you know, but things change. Suggesting that
people use `su` rather than `ssh` is a bad idea.
-Bill Clark
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------------------------------
From: [EMAIL PROTECTED] (William)
Subject: PPPD & PAP
Date: Tue, 27 Apr 1999 21:07:27 GMT
I am using Red Hat 5.2. Runnin mgetty & pppd, using pap to login.
Connection is working fine.
I got following problem:
How I can check current login user? I type who and got ppp00 user.
Any system log I can check user usage?
Can I use dhcp for my ppp modem?
Thx a lot
------------------------------
From: [EMAIL PROTECTED] (Darryl L. Pierce)
Subject: Re: FTP Win98 <==> Linux
Date: Tue, 27 Apr 1999 13:21:43 GMT
On 26 Apr 1999 16:32:23 GMT, Santosh Gautam <[EMAIL PROTECTED]> wrote:
;I am trying to Network Linux 5.2 (Red Hat) and Win 98. They both ping
;each other fine. I can Telnet from Win 98 and it works fine. But, when I
;FTP from Linux to Win 98 it says "connection refused" and when I FTP from
;Win 98 to Linux, It says "Waiting for welcome message .." and stays there
;forever without doing anything. Please help.
Do you have an FTP server running on your Windows 98 box? The message you're
receiving tells me either you don't (which is the default, Windows 95 & 98
don't come with FTP server software) or you do but it's not active. Have you
installed the Personal Web Server for '98?
---
Darryl L. Pierce, Software Engineer, Resource Solutions, Int'l
------------------------------
From: [EMAIL PROTECTED]
Subject: Re: @home anyone? is it worthwhile or not?
Date: Tue, 27 Apr 1999 21:23:26 GMT
I have @home and also have a static IP. I am using IP Masquerading and as far
as @home knows I only have 1 box connected. I have had mixed results with
speed though, some days I download at 20K/b and others it's 200K/b. But all
in all I would not go back to dialup.
In article <[EMAIL PROTECTED]>,
<[EMAIL PROTECTED]> wrote:
> Greetings & Salivations.
>
> I'm starting to setup RHL 5.2 on a small ethter net, 3 linux machines, a
> mac and an STe, and I'm considering using the @home cablemodem service
> for my net connection. I've heard some say it's really cool, others
> call it bunk. Anyone here have personal experience with it?
>
> Another thing I've heard a while back from fellow linux user who has it
> is that he end up with a static ip address! anyone else have this
> experience?
>
> bfn,
> James
>
>
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------------------------------
From: [EMAIL PROTECTED]
Subject: Re: socket leak on alpha.
Date: Wed, 28 Apr 1999 00:59:48 GMT
We're seeing EAGAIN/EWOULDBLOCK (same error) errors on 2.2.5 on a dual
Pentium III SCSI Compaq.
We make a bunch of non-blocking tcp connections over and over again. It
seems to fail for us after 10 seconds of continuos connections (~300 cps).
It then seems to be stuck in this EAGAIN state for a while (10-20 seconds),
and then it's fine again. This happens repeatedly.
We do not see the same problem on 2.0.36.
Any hints?
--Leo
In article <[EMAIL PROTECTED]>,
"Barrett G. Lyon" <[EMAIL PROTECTED]> wrote:
> I seem to be having a socket leak in 2.2.x, the symptoms are that connect()
> just stops working returning EAGAIN.
>
> Another way to see the symptoms are:
>
> hostname:/$> telnet localhost
> Trying 127.0.0.1...
> telnet: Unable to connect to remote host: Resource temporarily unavailable
>
> Quickly after booting I see tcp_bind_bucket rise.
> cat /proc/slabinfo | grep tcp_bind_bucket
>
> But the number of connections etc.. do not reflect the same nubmers that I
> see in the /proc/slabinfo.
>
> I was forced to up the ip port range so that the 'pool' is large and my box
> can stay up a bit longer.
>
> echo "1024 60000" >/proc/sys/net/ipv4/ip_local_port_range
>
> And quickly after that I started to graph the tcp_bind_bucket:
>
> http://www.doxx.net/load/arsenic.slab..gif
>
> The graph is updated every two minutes, and the machine is about to die,
> but I think the graph shows the leak pretty well.
>
> Any ideas?
>
> -Barrett
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [EMAIL PROTECTED]
> Please read the FAQ at http://www.tux.org/lkml/
>
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------------------------------
From: "news" <[EMAIL PROTECTED]>
Subject: 3c59x : unresolved symbol(s) problem in linux v2.2.6
Date: Tue, 27 Apr 1999 16:11:50 -1000
Hi All,
I was hoping someone can lend some insight into this problem. I used to run
v2.0.35 of the kernel just fine, then I upgraded to v2.2.6 and now the
module 3c59x.o doesn't work. I get the error
/lib/modules/2.2.6/net/3c59x.o: unresolved symbol(s)
when I do a depmod -a
Can anyone point me in the right direction as to what I need to do to get
this thing to work.
I can compile it into the kernel, but I don't know how to send the
options=12 line to it. If anyone can tell me how to do that, I would
appreciate it as well.
Ross Ishida
University of Hawaii, SOEST/RCF
------------------------------
From: [EMAIL PROTECTED] (Diederick van Dijk)
Crossposted-To: comp.protocols.ppp
Subject: Re: Linux client, NT server, and callback problems...
Date: Tue, 27 Apr 1999 07:28:55 GMT
[EMAIL PROTECTED] wrote:
>Hi All,
>
>Has anyone successfully connected a linux machine to an NT server running RAS
>*with callback* ?? (Getting the link to work without callback enabled wasn't
>really a problem)
>
>I'm running Slackware with (from memory!) kernel 2.1.103, and PPP 2.3.5.
>
>Dial-up was working fine until I set the NT server for callback. Linux dials
>in and authenticates OK, the remote server calls me back, the modem answers
>fine, but then pppd sits there for about ten seconds before terminating the
>link.
>
>I get the following in the logs (with 'kdebug 7' set) repeated several times -
>email me privately if ppp logs make a lot of sense to you and I can send
>more details...
>
>Apr 25 16:07:18 pukeko kernel: ppp0 released
>Apr 25 16:07:18 pukeko kernel: ppp0: ccp closed
>Apr 25 16:07:55 pukeko kernel: ppp: frame with bad fcs, length = 10
>Apr 25 16:07:55 pukeko kernel: ppp: bad frame, count = 10
>Apr 25 16:07:55 pukeko kernel: FF C0 00 21 C2 23 80 63 ...!.#.c
>Apr 25 16:07:55 pukeko kernel: F1 6D .m
><repeated several times>
>...
>
>Thanks for any help - only reference I've found to the 'bad fcs' messages
>indicate that it's usually when the NT server's trying to send me plain text
>at the start of the call, but that doesn't look the case from the logs.
>There's no default route added to my routing table at this point, so I guess
>ppp's still trying to form the link.
>
>my scripts are as follows:
>
>(connect script)
>
> #!/bin/sh
>
> pppd /dev/ttyS2 57600 crtscts nodetach modem \
> name "<domain>\\<user>" remotename remote debug kdebug 7 \
> domain <domainname> callback <callback number> \
> connect '/usr/sbin/chat -v -f /etc/ppp/chatscript.work.callback1'
>
> sleep 5
>
> pppd /dev/ttyS2 57600 crtscts modem name "<domain>\\<user>" \
> remotename remote \
> defaultroute debug kdebug 7 nodetach domain <domainname> \
> connect '/usr/sbin/chat -v -f /etc/ppp/chatscript.work.callback2'
>
>(initial chat script - 'callback1')
>
> ABORT BUSY
> ABORT "NO DIALTONE"
> ABORT ERROR
> ABORT "NO CARRIER"
> '' ATS7=45L2V1X4&C1E1Q0
> OK ATDT<numbertodial>
> CONNECT ""
>
>(second chat script - 'callback2')
>
> ABORT BUSY
> ABORT "NO DIALTONE"
> ABORT ERROR
>ABORT "NO CARRIER"
> RING ATA
> CONNECT "\c"
>
>more details available on request. I'd appreciate it if you'd cc me via email
>on any replies...
>
>cheers,
>
>Jules
>
>-----------== Posted via Deja News, The Discussion Network ==----------
>http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
Take a look on my web site. There is a mini howto about this topic.
Diederick
============================================================
Diederick van Dijk
Homepage: http://www.van-dijk.net
- Mini-Howto Linux PPP to NT with MS Chap and callback.
- Paper about installing RedHat linux 5.2 on a Compaq with
a Smart Array Controller
=============================================================
------------------------------
From: "Tad" <[EMAIL PROTECTED]>
Subject: Re: Telnet taking ages before allowing login
Date: Tue, 27 Apr 1999 19:26:22 -0700
>I have
>checked name resolution and other obvious things, but can't figure out what
it
>is doing for all that time. It does the same when connecting by name or IP
>Address and also when you do it on the console with 127.0.0.1.
Sounds like your /etc/hosts file is not configured properly.
T
------------------------------
From: [EMAIL PROTECTED] (Gregory C. Larkin)
Subject: Using tcpdump to monitor loopback ports
Date: Wed, 28 Apr 1999 02:38:33 GMT
Reply-To: [EMAIL PROTECTED]
Hi,
I am trying to set up tcpdump to monitor ports that have been
forwarded from an SSH server. I am using SSH to encrypt connections
made by the CVS source code management tools, running in client/server
mode.
The CVS server is set up to listen on port 2401 (via inetd). When the
session is encrypted with SSH, though, the connection on port 2401
comes from the SSH server running on the same machine, instead of a
host out on the Internet.
I have tried to use tcpdump to monitor the loopback interface like
this:
tcpdump -i lo -l dst port 2401
but that doesn't work. I have tested it with a simple "telnet
localhost 2401" and there is no output.
If I run it this way:
tcpdump -i lo -l
I will get output. The only problem is that it isn't filtered based
on the destination port. I will get unwanted messages if I have other
SSH port forwardings set up. Is there any way to make tcpdump limit
its output based on the host or port, when listening to the loopback
interface?
I have tried using the "host" keyword on the tcpdump command line,
too, and that also seems to yield no output when monitoring the
loopback interface.
Thanks for any tips,
Greg
Greg Larkin
Entropy Software
[EMAIL PROTECTED]
http://www.entropy.com/
------------------------------
From: [EMAIL PROTECTED] (Lew Pitcher)
Crossposted-To:
aus.computers.linux,comp.os.linux.x,comp.os.linux.setup,comp.os.linux.misc
Subject: Re: Need help setting up a remote X-term.
Reply-To: [EMAIL PROTECTED]
Date: Mon, 26 Apr 1999 17:08:02 GMT
On Mon, 26 Apr 1999 16:44:02 +0000, "Matthew B. Kennedy" <[EMAIL PROTECTED]> wrote:
>Greetings Linux and X users,
>
>I am using RH Linux 5.2. What I am having trouble with is setting up a
>connection from my Linux machine at home to a remote computer at work in
>order to use X remote applications from home. The idea is that I will
>use my local Linux X server to get allow me to use all the graphical X
>applications on the remote computer.
>
>I can't find any real specific documentation on how to to this, but this
>is what I have tried:
>
>1. I connect to the network using PPP (this all works -- I can access
>other services such mail and WWW for instance).
>
>2. Then I telnet to the remote machine using "telnet
>remote-machine.qut.edu.au" from my xterm prompt in Linux. I can get in
>alright under text mode.
>
>3. Once in the remote machine under telnet, I set the DISPLAY variable
>to be the (dynamically allocated) IP address of my local machine)
>followed by :0.0 (eg. export DISPLAY=131.181.123.456:0.0). Note, I get
>the local IP address information by running traceroute -- is there a
>better/ more direct way?
>
>4. Then I run a graphical X application like xemacs. And it just hangs
>at the prompt.
>
>I have tried using the local "xhost" command to add
>remote-machine.qut.edu.au. But this doesn't seem to make much of a
>difference either.
>
>Note that I have previously been able to connect and access these X
>programs on the remote computer under windows using X server emulator
>like MIX and Xcursion. The technique was similar -- login with telnet,
>configure the DISPLAY variable on the remote machine and then fire up
>the X server emulator.
>
>Any help with this would be greatly appreciated. I thought using the
>dinki-di X server that comes with Linux would make it a breeze --
>obviously I'm doing something simple wrong...
>
Two possibilities...
1) Are you waiting long enough? X is bandwidth-hungry unless you're using something
like LBX (Low Bandwidth X). Some X clients have taken minutes to start up when I've
tried this trick (but they do start up).
2) Is there a filtering firewall between your Linux box and the x client machine? If
so,
does it filter (refuse to forward) packets destined for your X ports? IIRC, X
clients
talk to ports 7000+ on the X server IIRC.
Lew Pitcher
System Consultant, Integration Solutions Architecture
Toronto Dominion Bank
([EMAIL PROTECTED])
(Opinions expressed are my own, not my employer's.)
------------------------------
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End of Linux-Networking Digest
******************************
