5b2: Unable to open listen socket for [v1.::1]:631 SOLVED

[bittwister]

I am unable to communicate with my HP_Photoshop_C3100 series usb printer.
It appears it wants an inv6 address. System is set for ipv4 addresses.
The basic error is:
Unable to open listen socket for address [v1.::1]:631

Clean install of Mageia-5-beta2-x86_64-DVD.iso
No problems running in Mageia release 4 vanilla install.

tried localhost:631 in cups conf file. Still wants ipv6.

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$ grep localhost /etc/hosts
127.0.0.1 localhost.localdomain localhost

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$ cat  /etc/sysconfig/network
NEEDHOSTNAME=no
NETWORKING=yes
HOSTNAME=wb.hom.test
CRDA_DOMAIN=US
IPV6_AUTOCONF=no

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$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.0.1     0.0.0.0         UG    10     0        0 enp3s0
169.254.0.0     0.0.0.0         255.255.0.0     U     10     0        0 enp3s0
192.168.0.0     0.0.0.0         255.255.255.0   U     10     0        0 enp3s0


Suggestions anyone?

[jiml8]

Why are you attempting to establish a network connection to a USB device?

[doktor5000]

Please show the output of

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getent hosts localhost

and relevant lines of your /etc/cups/printers.conf

Apart from that, hostname should not be configured in /etc/sysconfig/network
Best use either hostnamectl to set it or put only the short hostname into /etc/hostname
and in /etc/hosts in the format

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127.0.0.1 yourshorthostname localhost

and any further aliases that you want to use at the end of the line.
localhost.locadomain should not be used - according to your route output, there seems also avahi running, and avahi will handle requests against .local domain

[bittwister]

Why are you attempting to establish a network connection to a USB device?

I am trying to print a text file my HP_Photoshop_C3100 series usb printer.
Guessing the first time the printer comes up maybe the HP driver is trying to push some firmware to the printer.

[doktor5000]

Please show the output of getent hosts localhost and relevant lines of your /etc/cups/printers.conf

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# grep 1 /etc/cups/printers.conf | egrep -v "\#|Time"
<DefaultPrinter HP_Photosmart_C3100_series>
UUID urn:uuid:2742c291-5731-3854-4e9f-e44e86aa683b
DeviceURI hp:/usb/Photosmart_C3100_series?serial=CN65FB21RJ04KV


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$ getent hosts localhost
::1             localhost

Now that just bites and is a bit of a lie if I understand getent usage correctly because there are no ipv6 values for localhost.

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$ grep loc /etc/hosts
127.0.0.1 localhost.localdomain localhost


Apart from that, hostname should not be configured in /etc/sysconfig/network

Heheh, out of the box install puts it there. Only reason I showed /etc/sysconfig/network was to show I had disabled some ipv6 stuff.

Best use either hostnamectl to set it

Oh NO, surly NOT a systemd gotcha.

or put only the short hostname into /etc/hostname

Hmmm, not the short name. During network setup section of install, you/I always enter the FQDN which will set it both /etc/sysconfig/network (since Mandrake/Mandriva) and. /etc/hostname (Mageia 3, I think) unless your setup is getting the domain from some upstream source.

and in /etc/hosts in the format

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127.0.0.1 yourshorthostname localhost

and any further aliases that you want to use at the end of the line.
localhost.locadomain should not be used - according to your route output, there seems also avahi running, and avahi will handle requests against .local domain

Hm, been using "127.0.0.1 localhost.locadomain localhost" on all my installs and I think had enabled avahi to see if would help and forgot to disable it and reboot before posting.

Looking in my VirtualBox mga5b2 with /etc/hosts which has

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127.0.0.1 localhost

I see

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$ getent hosts localhost
::1             localhost

Offhand I say systemctl is causing all my grief.

If no other suggestions, I believe I need to open a bug report.

[doktor5000]

Offhand I say systemctl is causing all my grief.

Can you please explain the relation between systemd and name resolution? systemd isn't the scapegoat for everything ...

And you should read up on getent - it directly queries the name resolver when you query it for hosts.
As far as I'm aware it's the most correct way to resolve names, respecting order configured in /etc/nsswitch.conf.

Aprt from that, recently there has been a discussion about hostname and maybe name resolver regressions, might be related:
https://ml.mageia.org/wwsympa-wrapper.f ... 00325.html

[doktor5000]

Offhand I say systemctl is causing all my grief.

Can you please explain the relation between systemd and name resolution? systemd isn't the scapegoat for everything ...

You could be correct. When you indicated hostnamectl I just figured it was systemd and I would be required to run it to set localhost as just 127.0.0.1.

And you should read up on getent - it directly queries the name resolver when you query it for hosts.
As far as I'm aware it's the most correct way to resolve names, respecting order configured in /etc/nsswitch.conf.

I thought getent just hit the indicated /etc/file. Examples: getent group $USER or getent passwd $USER

Lets look at your suggestions:

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$ grep ^hosts: /etc/nsswitch.conf
hosts:          files dns myhostname

Suggests /etc/hosts is checked first, so

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$ grep  localhost /etc/hosts
127.0.0.1 localhost.localdomain localhost

If not there ask dns resolver

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$ dig +short localhost
127.0.0.1

Hm, what happens if using node name.

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$ hostname
wb.home.test

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$ grep $(hostname) /etc/hosts
192.168.0.132 wb.home.test wb

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$ dig +short $(hostname)
192.168.0.132

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$ getent hosts $(hostname)
::1             wb.home.test

FYI: added NOZEROCONF=yes to /etc/sysconfig/network to suppress the avahi route.

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$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.0.1     0.0.0.0         UG    10     0        0 enp3s0
192.168.0.0     0.0.0.0         255.255.255.0   U     10     0        0 enp3s0


And do not have the the daemon running.

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$ systemctl status avahi-daemon | grep -i active
   Active: inactive (dead)

Apart from that, recently there has been a discussion about hostname and maybe name resolver regressions, might be related:
https://ml.mageia.org/wwsympa-wrapper.f ... 00325.html

Ok, I guess I will open a bug report against getent returning ipv6 addresses and another bug against the udevxxxxx.service returning a address [v1.::1 error and indicating it might be related to my getent bug.

[bittwister]

Ok, I guess I will open a bug report against getent returning ipv6 addresses

Opened https://bugs.mageia.org/show_bug.cgi?id=15126 about the getent returning ipv6 address.

Marking this thread solved since I can hide the problem by changing

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Listening *:651

to

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Listening 127.0.0.1:651

in /etc/cups/cupsd.conf

Going to guess there will be a few complaints from mga 4 ipv4 users converting to mga 5.
It was hard enough to stop named from complaining about ipv6 addresses.

That solution was to create a custom conf file in /etc/modprobe.d/ with the directive

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options ipv6 disable=1

[doktor5000]

That solution was to create a custom conf file in /etc/modprobe.d/ with the directive

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options ipv6 disable=1

Can be easily done via draknetcenter in advanced options.

[bittwister]

That solution was to create a custom conf file in /etc/modprobe.d/ with the directive

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options ipv6 disable=1

Can be easily done via draknetcenter in advanced options.

Creating an ipv6 to ipv4 tunnel seems like a waste of resources on a ipv4 setup.
I originally created the disable line to get named to quit complaining about accessing a whole bunch of ipv6 servers.

Flipping my LAN to ipv6 would cost $250+ to replace my two SiliconDust TV tuners and add an inferred detector for the TV remote then waste the WAN router's time converting it all back to my ISP's ipv4 network.

I do Thank you for all your time helping users and your Mageia work.

[doktor5000]

That solution was to create a custom conf file in /etc/modprobe.d/ with the directive

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options ipv6 disable=1

Can be easily done via draknetcenter in advanced options.

Creating an ipv6 to ipv4 tunnel seems like a waste of resources on a ipv4 setup.

Huh? It says "Disable IPv6" in draknetcenter ...

[bittwister]

That solution was to create a custom conf file in /etc/modprobe.d/ with the directive

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options ipv6 disable=1

Can be easily done via draknetcenter in advanced options.

Creating an ipv6 to ipv4 tunnel seems like a waste of resources on a ipv4 setup.

Huh? It says "Disable IPv6" in draknetcenter ...

Well, duh. Back to speed reading 101 for me.
I had clicked my nic interface and drilled down to Adv instead of seeing the "Advanced settings" button next to the Quit button at bottom of Network Center.

I am off to remove my custom change, reboot and see what happens.