Issue #3038 has been updated by newnix.

Status changed from New to Resolved

Sorry I didn't get back to you sooner, just rebuilt with the patch, no longer 
need to set ifconfig_em0="DHCP polling" in /etc/rc.conf, the patch appears to 
have solved the problem entirely.

----------------------------------------
Bug #3038: Intel Ethernet Could not Connect to Network
http://bugs.dragonflybsd.org/issues/3038#change-13146

* Author: newnix
* Status: Resolved
* Priority: Normal
* Assignee: 
* Category: Networking
* Target version: Latest stable
----------------------------------------
Upon trying to install DragonFly BSD 4.8 on a new Dell Optiplex 7040, I found 
that em0 would not receive any DHCPOFFER packets when trying to connect via 
DHCP and tcpdump found no traffic either after ensuring that the interface was 
up and active.
While in the IRC chat, it was suggested to run `ifconfig em0 polling` which 
resolved the issue, it's believed that the problem was with the interrupt not 
being mapped correctly for the hardware. As suggested, I've attached my verbose 
dmesg logs as well as the output from pciconf to help in fixing this problem. 
In the meantime, I've found that adding ifconfig_em0="DHCP npolling" to my 
/etc/rc.conf has taken care of this problem, allowing me to use my system as 
normal.

dmesg_verbose.txt - booting with verbose logging enabled, no special settings 
in /etc/rc.conf regarding em0
dmesg_verbose_dhcp.txt - booting with verbose logging, this time with 
ifconfig_em0="DHCP" set in /etc/rc.conf

---Files--------------------------------
dmesg_verbose.txt (58.3 KB)
dmesg_verbose_dhcp.txt (121 KB)
pciconf.txt (8.83 KB)


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