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Why does the MTA attempt to deliver IPv6 mail on port 24

My test XG has a IPv6 and 4 enabled. It quite happily sends mail out on port 25 using 'IPv4' addresses but tries to use port :: :24 for IPv6 deliveries.

I think I found out why and that is the way XG handles IPv6, not very well.

Ian

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0 lferrara over 7 years ago

Ian,

this is strange. Can you check which is the service that is using 24 port using this command:

netstat -lnptu | grep 24

You should find a line that contains :::24

Regards
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0 rfcat_vk over 7 years ago in reply to lferrara

Hi Luk,

the answer is awarrenmta. At this stage it is only the normal IP address because I have disabled IPv6, 127.0.0.1:24

Ian
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0 rfcat_vk over 7 years ago in reply to rfcat_vk

XG management mail is now stuck. Accepted by device for scanning and still using :: :24

Maybe a restart will let it see the world.

Ian
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0 lferrara over 7 years ago in reply to rfcat_vk

Ian,

I do not use IPv6 on my box so I cannot confirm the behaviour. It is strange that the same services listens on different port.

I would expect a 0.0.0.0:25 and not 2 different one for IPv4 and IPv6.

Regards
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0 rfcat_vk over 7 years ago in reply to lferrara

Hi Luk,

are you using MTA or the transparent proxy for mail?

Ian
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0 rfcat_vk over 7 years ago in reply to rfcat_vk

Here is a screen shot of the same command on an XG not running MTA

Ian
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0 lferrara over 7 years ago in reply to rfcat_vk

Ian,

I am running Xg as transparent proxy at home. In production I am not using MTA because it lacks of features set.

So the difference is with MTA mode.

sachingurung or Aditya Patel could spend some words on this.
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0 rfcat_vk over 7 years ago in reply to lferrara

Hi folks,

more testing results.

Changed mail to transparent proxy. Still unable to send from mac or XG. Restarted XG, no affect on mail sending. Disabled SMTP checking in mail rule was able to send from mac. Enabled smtp check in mail rule unable to send from mac. Restarted XG and mail client, success from mac, but not from XG which is still using :: :24 for reports etc.

At this stage the choices are wait for V17b or rebuild the XG to get mail reporting to work.

Ian
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0 rfcat_vk over 7 years ago in reply to rfcat_vk

Hi folks,

another strange twist. Outgoing mail is now frozen and listening on port :: :0.

Ian
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0 lferrara over 7 years ago in reply to rfcat_vk

Ian,

I am using MAC too and SMTP email is working with no issue on 465 port.

SFVH_SO01_SFOS 16.05.7 MR-7# netstat -lnptu | grep -E "464 |24 |25 "
tcp        0      0 0.0.0.0:464             0.0.0.0:*               LISTEN      2426/awarrensmtp
tcp        0      0 127.0.0.1:24            0.0.0.0:*               LISTEN      2465/awarrenmta
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      2426/awarrensmtp
tcp        0      0 :::464                  :::*                    LISTEN      2426/awarrensmtp
tcp        0      0 :::25                   :::*                    LISTEN      2426/awarrensmtp

This is the outout of XG acting in transparent mode.
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0 lferrara over 7 years ago in reply to rfcat_vk

Ian,

I am using MAC too and SMTP email is working with no issue on 465 port.

SFVH_SO01_SFOS 16.05.7 MR-7# netstat -lnptu | grep -E "464 |24 |25 "
tcp        0      0 0.0.0.0:464             0.0.0.0:*               LISTEN      2426/awarrensmtp
tcp        0      0 127.0.0.1:24            0.0.0.0:*               LISTEN      2465/awarrenmta
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      2426/awarrensmtp
tcp        0      0 :::464                  :::*                    LISTEN      2426/awarrensmtp
tcp        0      0 :::25                   :::*                    LISTEN      2426/awarrensmtp

This is the outout of XG acting in transparent mode.
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0 rfcat_vk over 7 years ago in reply to lferrara

Hi Luk,

my main XG does not have a problem, it is the XG I built to test IPv6 which used MTA by default. I have changed the mail back to transparent proxy and no outgoing mail.

I am waiting for v17b before deciding on a rebuild from scratch and not use MTA or just using the v17b overwrite. Time and testing will tell.

Ian
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