Setting netmask permanently

[Geoffrey Leach]

Device vendor insists on a netmask 255.255.0.0, so
% ifconfig eno1 169.254.10.6  netmask 255.255.0.0
which changes netmask, but it soon reverts to the original
value 255.255.255.255

ifdown/ifup does not change the situation

Any ideas?

[Terry Polzin]

have you edited /etc/sysconfig/network-scripts/ifcfg-eno1

On Sat, Mar 26, 2022 at 6:42 PM Geoffrey Leach 
wrote:
> Device vendor insists on a netmask 255.255.0.0, so
> % ifconfig eno1 169.254.10.6  netmask 255.255.0.0
> which changes netmask, but it soon reverts to the original
> value 255.255.255.255
>
> ifdown/ifup does not change the situation
>
> Any ideas?
>
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[Geoffrey Leach]

Would that I could. AFAIK those files are no longer used in Fedora 35.

On Sat, Mar 26, 2022 at 4:11 PM Terry Polzin  wrote:
> have you edited /etc/sysconfig/network-scripts/ifcfg-eno1
>
> On Sat, Mar 26, 2022 at 6:42 PM Geoffrey Leach 
> wrote:
> > Device vendor insists on a netmask 255.255.0.0, so
> > % ifconfig eno1 169.254.10.6  netmask 255.255.0.0
> > which changes netmask, but it soon reverts to the original
> > value 255.255.255.255
> >
> > ifdown/ifup does not change the situation
> >
> > Any ideas?
> >
> > users mailing list -- [e-mail]
> > To unsubscribe send an email to [e-mail]
> > Fedora Code of Conduct:
> > https://docs.fedoraproject.org/en-US/project/code-of-conduct/
> > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
> > List Archives:
> > https://lists.fedoraproject.org/archives/list/[e-mail]
> > Do not reply to spam on the list, report it:
> > https://pagure.io/fedora-infrastructure
>
> users mailing list -- [e-mail]
> To unsubscribe send an email to [e-mail]
> Fedora Code of Conduct:
> https://docs.fedoraproject.org/en-US/project/code-of-conduct/
> List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
> List Archives:
> https://lists.fedoraproject.org/archives/list/[e-mail]
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[Samuel Sieb]

On 3/26/22 20:17, Geoffrey Leach wrote:
> Would that I could. AFAIK those files are no longer used in Fedora 35.
>
> On Sat, Mar 26, 2022 at 4:11 PM Terry Polzin <[e-mail] 
> > wrote:
> have you edited /etc/sysconfig/network-scripts/ifcfg-eno1
>
> On Sat, Mar 26, 2022 at 6:42 PM Geoffrey Leach
> <[e-mail] <mailto:[e-mail]>> wrote:
>
>     Device vendor insists on a netmask 255.255.0.0, so
>     % ifconfig eno1 169.254.10.6  netmask 255.255.0.0
>     which changes netmask, but it soon reverts to the original
>     value 255.255.255.255
>
>     ifdown/ifup does not change the situation

If you don't edit the config fles, then NetworkManager is going to keep 
"fixing" the interface.
The new location is /etc/NetworkManager/system-connections/
Are you not using a graphical desktop of some sort?  The network config 
tool for your desktop would be the thing to use.  If not, then use 
"nm-connection-editor".

[Tim]

On Sat, 2022-03-26 at 15:41 -0700, Geoffrey Leach wrote:
> Device vendor insists on a netmask 255.255.0.0, so
> % ifconfig eno1 169.254.10.6  netmask 255.255.0.0
> which changes netmask, but it soon reverts to the original
> value 255.255.255.255
>
> ifdown/ifup does not change the situation

What device vendor?  What kind of device?  What are trying to do?

169.254.x.y addresses are link-local addresses.  Used by machines
automatically setting their own IPs to a random address (rather than by
an external DHCP server giving them an IP, or you manually setting
one). As such, those addresses will only work within their own little
network.

Generally speaking, computers will automatically use link-local
addresses as a last resort when not configured in some other way, and
it will have the expected 255.255.0.0 netmask.  If something else sets
its address, you'll get whatever *that* dictated.

I've never seen link-local addresses work outside a LAN.  i.e. all
computers inside the LAN on those addresses can intercommunicate, but
none can access the internet through the router.  Though I've never
tried setting the router into that address pool, to see if it can act
as a gateway, nor do I want to (it's a pain to reconfigure, and if I
had to factory reset there's a lot of work that needs doing to unset
the crappy factory default settings).