Re: DHCP fails on wired Ethernet after F29-F30 upgrade

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On 5/26/19 5:16 PM, Robert G. (Doc) Savage via users wrote:
> Fedora has evolved so much with NetworkManager, systemd, and other
> major changes. I've lost track of how a DHCP transaction actually takes
> place in Fedora now, and what supporting services are at play. Other
> than journalctl, I don't know where to look any more.

Well, in your initial message you said you had the following in your log.

May 25 02:18:33 tiger.protogeek.org NetworkManager[1217]: <info>  [1558768713.6863] dhcp4 (enp0s31f6): dhclient started with pid 21697
May 25 02:18:33 tiger.protogeek.org dhclient[21697]: DHCPDISCOVER on enp0s31f6 to 255.255.255.255 port 67 interval 4 (xid=0x94236275)
May 25 02:18:37 tiger.protogeek.org dhclient[21697]: DHCPDISCOVER on enp0s31f6 to 255.255.255.255 port 67 interval 4 (xid=0x94236275)
May 25 02:18:41 tiger.protogeek.org dhclient[21697]: DHCPDISCOVER on enp0s31f6 to 255.255.255.255 port 67 interval 11 (xid=0x94236275)

A working interface should show something like....

May 26 14:10:57 f30-k.greshko.com NetworkManager[809]: <info>  [1558851057.6606] dhcp4 (enp0s3): dhclient started with pid 932
May 26 14:10:58 f30-k.greshko.com dhclient[932]: DHCPDISCOVER on enp0s3 to 255.255.255.255 port 67 interval 6 (xid=0x14de5a6e)
May 26 14:11:01 f30-k.greshko.com dhclient[932]: DHCPREQUEST on enp0s3 to 255.255.255.255 port 67 (xid=0x14de5a6e)
May 26 14:11:01 f30-k.greshko.com dhclient[932]: DHCPOFFER from 192.168.1.1
May 26 14:11:01 f30-k.greshko.com dhclient[932]: DHCPACK from 192.168.1.1 (xid=0x14de5a6e)
May 26 14:11:01 f30-k.greshko.com dhclient[932]: bound to 192.168.1.30 -- renewal in 40477 seconds.

That your system is sending multiple DHCPDISCOVER would seem to indicate that either the system isn't sending anything or the dhcpserver on your LAN isn't receiving it or ignoring it.

I would double check the interface configuration.  You may also want to use something like wireshark to verify what is being sent from the interface.  Ideally, you could check on the server side as well. 

-- 
Right: I dislike the default color scheme Wrong: What idiot picked the default color scheme
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