static ip

[greg612]

Let me give this one more shot first I want to figure out what im doing wrong. will let you know thanks

upon further trying yes please post a working yaml I want to test it on this

[TheFu]

$ lsb_release -d
No LSB modules are available.
Description:    Ubuntu 24.04 LTS

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:aa:fd:df brd ff:ff:ff:ff:ff:ff
    inet 172.22.22.12/24 brd 172.22.22.255 scope global enp1s0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:feaa:fddf/64 scope link 
       valid_lft forever preferred_lft forever

sudo more /etc/netplan/01-network-manager-01.yaml network:
  version: 2
  renderer: networkd
  ethernets:
     enp1s0:
       addresses:
          - 172.22.22.12/24
       dhcp4: false
       dhcp6: false
       routes:
         - to: default
           via: 172.22.22.1
       optional: true
       nameservers:
         addresses: [ "172.22.22.81","172.22.22.80" ]
         search: [example.foo,example.com]

This is a new install, so I still need to disable IPv6 and do a few more network things, but the static IP has been working since 5 minutes post-install. However, I am having an issue getting ssh with keys working which has stumped me so far. ssh -vvvv is providing lots of information and my key is seen, accepted, but not used. I have more research ... but I'm inclined to blame IPv6 right now.

[Doug S]

For networking to work correctly, 3 things are needed.

• IP address
• Subnet/Netmask
• Gateway IP

Many posts ago, I asked to see two commands (ip a AND ip r) from a working config which would have shown these things. I asked to see it with DHCP and a working configuration. Then we could easily setup the correct values for a static IP from the working DHCP information.

This stuff isn't really that hard.

Agreed.

We still need to see the output for "ip r" from the working DHCP setup. From reviewing the 6 pages of this thread, nowhere has it been confirmed/proved that 192.168.25.1 is actually the gateway.

[greg612]

james@mustang:~$ ip r
default via 192.168.25.1 dev eno1 proto static 
192.168.25.0/24 dev eno1 proto kernel scope link src 192.168.25.3

[TheFu]

- 192.168.25.3/24 to 192.168.25.1 using that subnet mask?

That doesn't seem right.
When you allow DHCP, what's the IP and gateway that works?
Doesn't the gateway need to be in the same subnet as the LAN?

I've been reading through the entire thread 1 more time. I get confused because short answers that don't include the question being answered clearly are confusing.

As I read my post above, I don't know what I was thinking. 192.168.25.3/24 via 192.168.25.1 (gw) DOES make perfect sense.


For some clarity, after any change is made to a netplan.yaml file, 2 commands are mandatory,

sudo netplan generate --debug  # assuming this doesn't have any errors/warnings.
sudo netplan apply

I don't recognize the DNS servers being used. I use 1.1.1.1 and 1.0.0.1 for public DNS. When using IP addresses, DNS doesn't matter, so I've ignored it.
8.8.8.8 is google's (we want to watch you) DNS. Mostly it is just an easy, known, IP to ping. That's the entire point.

So, after each change with generate/apply steps, run these commands to provide a clear answer:

ip a  # show the IP address on the system
ip r |column -t   # show the routing table
ping 192.268.25.1   # ping your LAN router (use the correct IP for it if this is wrong)
ping 8.8.8.8   # ping a well-known internet IP

If we are starting over 100%, showing the working DHCP version, then the desired static IP version would be helpful.
Clearly label each group of commands with the scenario. Let's act like this is 100% new thread and step back.
You should also verify that the DHCP range configured inside your DHCP server has limits. It shouldn't be the entire /24 subnet. When choosing the range for static IPs, always choose an IP outside the DHCP range and ensure it isn't already being used.

We all know these things, but for being very clear, thought I'd post them.

[greg612]

 ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=58 time=18.0 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=58 time=16.5 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=58 time=15.9 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=58 time=16.8 ms
64 bytes from 8.8.8.8: icmp_seq=5 ttl=58 time=16.3 ms
64 bytes from 8.8.8.8: icmp_seq=6 ttl=58 time=17.0 ms
64 bytes from 8.8.8.8: icmp_seq=7 ttl=58 time=16.6 ms
64 bytes from 8.8.8.8: icmp_seq=8 ttl=58 time=16.1 ms
64 bytes from 8.8.8.8: icmp_seq=9 ttl=58 time=16.6 ms
64 bytes from 8.8.8.8: icmp_seq=10 ttl=58 time=17.3 ms
^C
--- 8.8.8.8 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9013ms
rtt min/avg/max/mdev = 15.936/16.705/17.995/0.577 ms


james@mustang:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether f8:b1:56:e4:ca:fc brd ff:ff:ff:ff:ff:ff
    altname enp0s25
    inet 192.168.25.54/24 metric 100 brd 192.168.25.255 scope global dynamic eno1
       valid_lft 7011sec preferred_lft 7011sec
    inet6 fe80::fab1:56ff:fee4:cafc/64 scope link 
       valid_lft forever preferred_lft forever


james@mustang:~$ ip r
default via 192.168.25.1 dev eno1 proto dhcp src 192.168.25.54 metric 100 
192.168.25.0/24 dev eno1 proto kernel scope link src 192.168.25.54 metric 100 
192.168.25.1 dev eno1 proto dhcp scope link src 192.168.25.54 metric 100 
james@mustang:~$

Stock out of box working network.

[greg612]

The dns I use is quad9

[greg612]

 lsb_release -d
No LSB modules are available.
Description:    Ubuntu 24.04 LTS
james@mustang:~$ ip r
default via 192.168.25.1 dev eno1 proto static 
192.168.25.0/24 dev eno1 proto kernel scope link src 192.168.25.3 
james@mustang:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether f8:b1:56:e4:ca:fc brd ff:ff:ff:ff:ff:ff
    altname enp0s25
    inet 192.168.25.3/24 brd 192.168.25.255 scope global eno1
       valid_lft forever preferred_lft forever
    inet6 fe80::fab1:56ff:fee4:cafc/64 scope link 
       valid_lft forever preferred_lft forever

[greg612]

I got this straight from netplan for this 24.04 working yaml

network:
    version: 2
    renderer: networkd
    ethernets:
        eno1:
          addresses:
              - 192.168.25.3/24
          nameservers:
              addresses: [9.9.9.9, 149.112.112.112]
          routes:
              - to: default
                via: 192.168.25.1

 ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
^C
--- 1.1.1.1 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 5151ms

james@mustang:~$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
8 packets transmitted, 0 received, 100% packet loss, time 7156ms

nope

[greg612]

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether f8:b1:56:e4:ca:fc brd ff:ff:ff:ff:ff:ff
    altname enp0s25
    inet 192.168.25.3/24 brd 192.168.25.255 scope global eno1
       valid_lft forever preferred_lft forever
    inet6 fe80::fab1:56ff:fee4:cafc/64 scope link 
       valid_lft forever preferred_lft forever
james@mustang:/etc/netplan$ ip r
default via 192.168.25.1 dev eno1 proto static 
192.168.25.0/24 dev eno1 proto kernel scope link src 192.168.25.3