[lug] Ubuntu 18.04 Route Metric

[D. Stimits]

>     On 05/20/2021 7:01 PM Bear Giles <bgiles at coyotesong.com> wrote:
>      
>      
>     I don't recall if netplan was supported in 18.04. It's taken a bit of time to get the hang of it(*) but the basics aren't too bad - it sounds like you want to set static values so it should be pretty straightforward.
> 
I want the metric to be custom at low priority (higher metric), or else to not have a default route at all on the private network (this is preferable). I just don't know how to do this while keeping DHCP.

The private net router is mine, but it seems useless in setting metric. I've changed "priority" in "nm-connection-editor", but this is ignored (apparently I can set to use DHCP or many other things from nm-connection-editor, but priority is summarily ignored). Can netplan be used to allow all DHCP, except to intercept metric or default route on one interface to either remove default route or force a low priority metric? This might be the right way.


>     Part of one of my files is:
> 
>     # Let NetworkManager manage all devices on this system
>     network:
>        version: 2
>        renderer: NetworkManager
>        ethernets:
>          # onboard-NIC
>          enp0s31f6:
>            dhcp4: false
>            addresses:
>             -http://192.168.1.3/24
>             -http://10.0.10.3/24
>             -http://10.0.20.3/24
>             -http://10.0.90.3/24
>            # gateway4: 192.168.1.1
>            nameservers:
>              search:
>               - lan
>              addresses:
>               - 10.0.20.15
>               - 10.0.10.10
>               - 8.8.8.8
>            routes:
>              - to:http://0.0.0.0/0
>                via: 192.168.1.1
>                metric: 100
>              # home GW to work VPN
>              - to:http://172.27.0.0/16
>                via: 192.168.1.200
>                metric: 10
> 
>     It has additional stanzas for the 10 Gbps(!) NICs. A system with wifi connectivity has
> 
>     # Let NetworkManager manage all devices on this system
>     network:
>       version: 2
>       renderer: NetworkManager
> 
>       wifis:
>            # all-wlans:
> 
>            wlp3s0:
>                match: {}
>                access-points:
>                  homewifi:
>                    password: 'password'
>                dhcp4: false
>                addresses:
>                   -http://192.168.1.9/24
>                   -http://10.0.10.9/24
>                gateway4: 192.168.1.1
>                nameservers:
>                   search:
>                     - lan
>                   addresses:
>                     - 10.0.10.15
>                     - 10.0.10.10
> 
> 
>     FWIW I've tried to match on MAC address - it would be nice because I could have one configuration file that I could deploy to all systems instead of needing to customize them, but I haven't been able to get them to work. Here's one attempt:
> 
>       wifis:
>         wlx9cefd5fcd82b:
>           match:
>             name: wlx9cefd5fcd82b
>            macaddress: "9c:ef:d5:fc:d8:2b"
> 
>     but I don't recall what had as the name . (That's the system's device name based on the MAC address.) Hmm... maybe I should have tried 'all-wans'.
> 
>     Bear
> 
>     On Thu, May 20, 2021 at 9:54 AM Zan Lynx < zlynx at acm.org mailto:zlynx at acm.org > wrote:
> 
>         > > On 5/20/21 8:34 AM, D. Stimits wrote:
> >         > Does anyone here know how to force my Ubuntu 18.04 to completely
> >         > leave out a default route for my private router? Or to permanently
> >         > set that route to a low priority, or to permanently set my public
> >         > interface to metric of 1?
> > 
> >         You must be using DHCP or this would not apply.
> > 
> >         Change your DHCP on your private network so that it does not apply any
> >         default route. Then each DHCP client will only have routes to the
> >         networks controlled by the private router.
> > 
> >         --
> >                          Knowledge is Power -- Power Corrupts
> >                                  Study Hard -- Be Evil
> > 
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