Please help with connection ADSL connection hangs

Please help with connection ADSL connection hangs

Post by Chuck Matter » Tue, 30 Jul 2002 15:47:22



I'm in the process of switching from AT&T Broadband to BellSouth ADSL
and have got everything working with two glaring exceptions: sendmail
and up2date.  Getting help with anything Linux from BellSouth probably
is a waste of time so I'm appealing to the group.

I've got one of the Alcatel Speed Touch Home units and have tried a
number of Linux based firewalls. I started with a RH6.2/ipchains
machine, when I found that up2date was* I tried upgrading to
RH7.3/iptables, when this exhibited the same problem I tried
implementing IPCop.  All have the same problem.  I decided to just cut
over and update my machines manually, once I cut over I found that
outbound sendmail is giving me trouble as well (yes I configured
sendmail correctly and once in a while a few messages do manage to get
through but the bulk are like the examples at the end of this post).
To ensure that the problem is not with my Linux configs I put a spare
disk in the OBSD firewall on the AT&T side and installed IPCop with
the same patches and setting as on the BellSouth side, it works
flawlessly, sendmail and up2date get through as does everything else.
The only differences between the two connections are as follows:

Good:
p133 32megs with IPCop 0.1.1p6<->ne2k clone<->Toshiba Cable modem<->attbi.com

Bad:
p233 80megs with IPCop 0.1.1p6<->ne2k clone<->Alcatel Speed Touch Home<->bellsouth.net

It seems to me that there must be something up with the Alcatel or the
wiring on the BellSouth side, although I am open to any reasonable
suggestion and would rather try unreasonable stuff here than try to
get do battle with BellSouth about these two apps.

In both the up2date and sendmail cases the connection is established
then stops.  I have some more detailed output below, please read on if
you can help.  I have also found that up2date run as an application on
the RedHat firewall machines themselves has the same problem.  I can
however alter the default route of the RedHat firewall attached to the
BellSouth pipe to point to the ip of the firewall on the AT&T pipe and
get a good update. I have tried dropping all of the firewalling rules
(actually rebooting and bringing up PPPoE (current release of Roaring
Penguin) with no firewalling enabled at all) and trying the up2date
that way, same symptom.  I suspect that getting up2date working may
well take care of my sendmail problems as well since the symptoms are
so similar (connection establishes then hangs).  I am thinking of
putting a hub in line between the firewall and the ADSL modem to do
some sniffing but am not sure if this will do any good or what to look
for.  Any thoughts would be appreciated.

With up2date the program starts but never gives any standard output,
eventually it fails with this message:

# up2date -vui --nox
Error communicating with server.  The message was:
Connection aborted by the user
Error communicating with server.  The message was:
EOF
#

While it's running I can see the connection in the output of netstat:

# netstat -a|grep redhat tcp        0   2589 gryphon:43989           xmlrpc.rhn.redhat:https ESTABLISHED
#

And the firewall shows the connection properly masqueraded:

TCP  149:33.40 192.168.1.1          216.148.218.165      43989 (61061) -> 443

In the case of sendmail jobs go into the queue fine but get deferred:

# sendmail -bp
                /var/spool/mqueue (3 requests)
----Q-ID---- --Size-- -----Q-Time----- ------------Sender/Recipient------------

                 (Deferred: Connection reset by mx06.mail.bellsouth.net.)


                 (reply: read error from mx06.mail.bellsouth.net.)


                 (reply: read error from mx07.mail.bellsouth.net.)

#

If I try to run the queue manually here's what I get (FWIW each of the hangs
depicted below lasts for about 10-15 minutes before losing the connection):

# sendmail -v -q

Running /var/spool/mqueue/g6LDinu01736 (sequence 1 of 3)
g6LDinu01736: locked

Running /var/spool/mqueue/g6LDoY001808 (sequence 2 of 3)

421 imf17bis.bellsouth.net connection refused from [67.33.179.119]

Quote:>>> QUIT



220 mail.bellsouth.net ESMTP server (InterMail vM.5.01.04.19 201-253-122-122-119-20020516) ready Sun, 21 Jul 2002 17:20:40 -0400
Quote:>>> EHLO gryphon.myth.bellsouth.net

250-imf01bis.bellsouth.net
250-HELP
250-PIPELINING
250-DSN
250-8BITMIME
250 SIZE 10485760


Quote:>>> DATA

354 Ok Send data ending with <CRLF>.<CRLF>

Quote:>>> .

[15 minute hang]

421 imf01bis.bellsouth.net Lost connection to [67.33.179.119]

Quote:>>> QUIT


220 mail.bellsouth.net ESMTP server (InterMail vM.5.01.04.19 201-253-122-122-119-20020516) ready Sun, 21 Jul 2002 17:25:41 -0400
Quote:>>> EHLO gryphon.myth.bellsouth.net

250-imf09bis.bellsouth.net
250-HELP
250-PIPELINING
250-DSN
250-8BITMIME
250 SIZE 10485760


Quote:>>> DATA

354 Ok Send data ending with <CRLF>.<CRLF>

Quote:>>> .

[15 minute hang]

421 imf09bis.bellsouth.net Lost connection to [67.33.179.119]

Quote:>>> QUIT



Quote:>>> QUIT

220 mail.bellsouth.net ESMTP server (InterMail vM.5.01.04.19 201-253-122-122-119-20020516) ready Sun, 21 Jul 2002 17:30:41 -0400
Quote:>>> EHLO gryphon.myth.bellsouth.net

250-imf05bis.bellsouth.net
250-HELP
250-PIPELINING
250-DSN
250-8BITMIME
250 SIZE 10485760


Quote:>>> DATA

354 Ok Send data ending with <CRLF>.<CRLF>
Quote:>>> .

421 imf05bis.bellsouth.net Lost connection to [67.33.179.119]
Quote:>>> QUIT


--
-----------------------------------------------------------------------
|Chuck Mattern          | "People often find it easier to be a result |

-----------------------------------------------------------------------

 
 
 

Please help with connection ADSL connection hangs

Post by Germann Arlingto » Tue, 30 Jul 2002 17:36:07


On Monday 29 Jul 2002 06:47 in comp.os.linux.networking group someone called


> I'm in the process of switching from AT&T Broadband to BellSouth ADSL
> and have got everything working with two glaring exceptions: sendmail
> and up2date.  Getting help with anything Linux from BellSouth probably
> is a waste of time so I'm appealing to the group.

> I've got one of the Alcatel Speed Touch Home units and have tried a
> number of Linux based firewalls. I started with a RH6.2/ipchains
> machine, when I found that up2date was* I tried upgrading to
> RH7.3/iptables, when this exhibited the same problem I tried
> implementing IPCop.  All have the same problem.  I decided to just cut
> over and update my machines manually, once I cut over I found that
> outbound sendmail is giving me trouble as well (yes I configured
> sendmail correctly and once in a while a few messages do manage to get
> through but the bulk are like the examples at the end of this post).
> To ensure that the problem is not with my Linux configs I put a spare
> disk in the OBSD firewall on the AT&T side and installed IPCop with
> the same patches and setting as on the BellSouth side, it works
> flawlessly, sendmail and up2date get through as does everything else.
> The only differences between the two connections are as follows:

> Good:
> p133 32megs with IPCop 0.1.1p6<->ne2k clone<->Toshiba Cable
> modem<->attbi.com

> Bad:
> p233 80megs with IPCop 0.1.1p6<->ne2k clone<->Alcatel Speed Touch
> Home<->bellsouth.net

> It seems to me that there must be something up with the Alcatel or the
> wiring on the BellSouth side, although I am open to any reasonable
> suggestion and would rather try unreasonable stuff here than try to
> get do battle with BellSouth about these two apps.

> In both the up2date and sendmail cases the connection is established
> then stops.  I have some more detailed output below, please read on if
> you can help.  I have also found that up2date run as an application on
> the RedHat firewall machines themselves has the same problem.  I can
> however alter the default route of the RedHat firewall attached to the
> BellSouth pipe to point to the ip of the firewall on the AT&T pipe and
> get a good update. I have tried dropping all of the firewalling rules
> (actually rebooting and bringing up PPPoE (current release of Roaring
> Penguin) with no firewalling enabled at all) and trying the up2date
> that way, same symptom.  I suspect that getting up2date working may
> well take care of my sendmail problems as well since the symptoms are
> so similar (connection establishes then hangs).  I am thinking of
> putting a hub in line between the firewall and the ADSL modem to do
> some sniffing but am not sure if this will do any good or what to look
> for.  Any thoughts would be appreciated.

> With up2date the program starts but never gives any standard output,
> eventually it fails with this message:

> # up2date -vui --nox
> Error communicating with server.  The message was:
> Connection aborted by the user
> Error communicating with server.  The message was:
> EOF
> #

> While it's running I can see the connection in the output of netstat:

> # netstat -a|grep redhat tcp        0   2589 gryphon:43989          
> # xmlrpc.rhn.redhat:https ESTABLISHED
> #

> And the firewall shows the connection properly masqueraded:

> TCP  149:33.40 192.168.1.1          216.148.218.165      43989 (61061) ->
> 443

> In the case of sendmail jobs go into the queue fine but get deferred:

> # sendmail -bp
>                 /var/spool/mqueue (3 requests)
> ----Q-ID---- --Size-- -----Q-Time-----
> ------------Sender/Recipient------------

>                  (Deferred: Connection reset by mx06.mail.bellsouth.net.)


>                  (reply: read error from mx06.mail.bellsouth.net.)


>                  (reply: read error from mx07.mail.bellsouth.net.)

> #

> If I try to run the queue manually here's what I get (FWIW each of the
> hangs depicted below lasts for about 10-15 minutes before losing the
> connection):

> # sendmail -v -q

> Running /var/spool/mqueue/g6LDinu01736 (sequence 1 of 3)
> g6LDinu01736: locked

> Running /var/spool/mqueue/g6LDoY001808 (sequence 2 of 3)

> 421 imf17bis.bellsouth.net connection refused from [67.33.179.119]
>>>> QUIT


> 220 mail.bellsouth.net ESMTP server (InterMail vM.5.01.04.19
> 201-253-122-122-119-20020516) ready Sun, 21 Jul 2002 17:20:40 -0400
>>>> EHLO gryphon.myth.bellsouth.net
> 250-imf01bis.bellsouth.net
> 250-HELP
> 250-PIPELINING
> 250-DSN
> 250-8BITMIME
> 250 SIZE 10485760




>>>> DATA
> 354 Ok Send data ending with <CRLF>.<CRLF>
>>>> .

> [15 minute hang]

> 421 imf01bis.bellsouth.net Lost connection to [67.33.179.119]
>>>> QUIT

> 220 mail.bellsouth.net ESMTP server (InterMail vM.5.01.04.19
> 201-253-122-122-119-20020516) ready Sun, 21 Jul 2002 17:25:41 -0400
>>>> EHLO gryphon.myth.bellsouth.net
> 250-imf09bis.bellsouth.net
> 250-HELP
> 250-PIPELINING
> 250-DSN
> 250-8BITMIME
> 250 SIZE 10485760




>>>> DATA
> 354 Ok Send data ending with <CRLF>.<CRLF>
>>>> .

> [15 minute hang]

> 421 imf09bis.bellsouth.net Lost connection to [67.33.179.119]
>>>> QUIT


>>>> QUIT
> 220 mail.bellsouth.net ESMTP server (InterMail vM.5.01.04.19
> 201-253-122-122-119-20020516) ready Sun, 21 Jul 2002 17:30:41 -0400
>>>> EHLO gryphon.myth.bellsouth.net
> 250-imf05bis.bellsouth.net
> 250-HELP
> 250-PIPELINING
> 250-DSN
> 250-8BITMIME
> 250 SIZE 10485760




>>>> DATA
> 354 Ok Send data ending with <CRLF>.<CRLF>
>>>> .
> 421 imf05bis.bellsouth.net Lost connection to [67.33.179.119]
>>>> QUIT


Check TOS if you are allowed to run servers, some ISPs block corresponding
ports...
With sendmail check if you can send e-mail to other mail servers, I can see
that mail to your ISP's servers do not go through. If you can send e-mail
to other servers (yahoo...) then most likely your ISP is rejecting servers
from their address range, again - read TOS.
--
G.Arlington
== The more you know, then better you realise how little you really know.

 
 
 

Please help with connection ADSL connection hangs

Post by Chuck Matter » Thu, 01 Aug 2002 01:50:34


Thanks for the suggestions over the past several posts, the problem was
related to MTU size.  My ISP seems to be running at around 1250.
--
-----------------------------------------------------------------------
|Chuck Mattern          | "People often find it easier to be a result |

-----------------------------------------------------------------------