Arch Linux

heidegger

Member

Registered: 2013-04-24

Posts: 100

[Solved]IP Address issues using netctl with Static IP profile

Having a strange issue with my IP appearing as as DHCP assinged value on my router admin page while using netctl static IP profile.
The address shown as 192.168.0.43 (in this case) is not reachable via nmap or ping or ssh, but the static IP is reachable/scannable.
The address 192.168.0.43 shows my hostname and the correct MAC address.
On the router, I have a strange entry that doesn't appear as a connected device with an "undefined" IP address but a unique MAC that doesnt match my HW and no intentional spoof.

This is a very new install of Arch on a laptop that was created following the ArchWiki last weekend.
I am connecting via wifi.
output of my netctl profile:

Description='A simple WPA encrypted wireless connection using a static IP'
Interface=wlp2s0
Connection=wireless
Security=wpa
ESSID='xxx'
Key='xxx'
IP=static
Address='192.168.0.111/24'
Gateway='192.168.0.1'
DNS=('192.168.0.1')
# Uncomment this if your ssid is hidden
#Hidden=yes

Edit: The undefined IP device is not likely related.
Thanks,

Last edited by heidegger (2017-08-12 17:23:02)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,722

Re: [Solved]IP Address issues using netctl with Static IP profile

Please post the output of ip addr and of ip router

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
The shortest way to ruin a country is to give power to demagogues.— Dionysius of Halicarnassus
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How to Ask Questions the Smart Way

heidegger

Member

Registered: 2013-04-24

Posts: 100

Re: [Solved]IP Address issues using netctl with Static IP profile

[squeezed@squeezed ~]$ ip addr
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
       valid_lft forever preferred_lft forever
2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 9c:b7:0d:4d:9b:97 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.111/24 brd 192.168.0.255 scope global wlp2s0
       valid_lft forever preferred_lft forever
    inet6 2605:e000:1c0b:8270:9eb7:dff:fe4d:9b97/64 scope global mngtmpaddr dynamic
       valid_lft 571737sec preferred_lft 571737sec
    inet6 fe80::9eb7:dff:fe4d:9b97/64 scope link
       valid_lft forever preferred_lft forever
3: enp1s0: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether dc:0e:a1:7e:7d:df brd ff:ff:ff:ff:ff:ff

I assume you meant 'ip route' as router doesn't provide any output.

[squeezed@squeezed ~]$ ip route
default via 192.168.0.1 dev wlp2s0
192.168.0.0/24 dev wlp2s0 proto kernel scope link src 192.168.0.111

Last edited by heidegger (2017-08-12 15:01:24)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,722

Re: [Solved]IP Address issues using netctl with Static IP profile

Yeah, I meant route.  Sorry, still working on my first cup of coffee.

So, your IPv4 address is 192.168.0.111.  The 192.168.0.43 address is not claimed by your box; but you say the router shows that as your address; apparently nothing is at that address as the ping fails.

It is likely that the router is showing extant data left over from when you installed the system and that the lease is still valid.
What kind of router is it?  Does the router have a mechanism to reserve static addresses?  Does it have a mechanism to forget old leases?

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
The shortest way to ruin a country is to give power to demagogues.— Dionysius of Halicarnassus
---
How to Ask Questions the Smart Way

heidegger

Member

Registered: 2013-04-24

Posts: 100

Re: [Solved]IP Address issues using netctl with Static IP profile

I was actually trying to reserve the .111 address when I found that undefined IP originally (It didn't show up as a connected device).
I did reserve the .111 address for the hostname and MAC of the laptop, but upon rebooting the laptop it still shows .43.
The router is a Netgear C6300.
I have looked if I can release the old address but haven't yet been able.

Last edited by heidegger (2017-08-12 16:01:36)

heidegger

Member

Registered: 2013-04-24

Posts: 100

Re: [Solved]IP Address issues using netctl with Static IP profile

Rebooting the router fixed my non-issue. DOH!