（这也发布在 fedoraforum.org 上，但对于使用其他发行版的人来说可能会很有趣。）
大家好，
几个星期以来，我一直在尝试将运行 Fedora 23 的 Dell Inspiron 17 7731 连接到我的办公室有线网络（无线工作正常）。
一些相关信息：
# lspci
--snip--
02:00.0 Network controller: Intel Corporation Wireless 7260 (rev 73)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 5287 (rev 01)
03:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12)
--snip--
# uname -r
4.2.8-300.fc23.x86_64
# ifconfig
enp3s0f1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether b8:2a:72:a2:66:db txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 343 bytes 64568 (63.0 KiB)
TX errors 0 dropped 141 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 16551 bytes 2027803 (1.9 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 16551 bytes 2027803 (1.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.124.1 netmask 255.255.255.0 broadcast 192.168.124.255
ether 52:54:00:3d:9c:4c txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.26.63.219 netmask 255.255.240.0 broadcast 10.26.63.255
inet6 fe80::8286:f2ff:fe7e:9f6e prefixlen 64 scopeid 0x20<link>
ether 80:86:f2:7e:9f:6e txqueuelen 1000 (Ethernet)
RX packets 52385 bytes 48933298 (46.6 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 32812 bytes 11212005 (10.6 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
以下是一些日志输出：
Jan 09 13:10:24 mekagojira NetworkManager[1064]: <info> (enp3s0f1): device state change: config -> ip-config (reason 'none') [50 70 0]
Jan 09 13:10:24 mekagojira NetworkManager[1064]: <info> Activation (enp3s0f1) Beginning DHCPv4 transaction (timeout in 45 seconds)
Jan 09 13:10:24 mekagojira NetworkManager[1064]: <info> dhclient started with pid 10973
Jan 09 13:10:24 mekagojira dhclient[10973]: DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 6 (xid=0x72a3fc32)
Jan 09 13:10:25 mekagojira avahi-daemon[878]: Registering new address record for fe80::ba2a:72ff:fea2:66db on enp3s0f1.*.
Jan 09 13:10:30 mekagojira dhclient[10973]: DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 13 (xid=0x72a3fc32)
Jan 09 13:10:33 mekagojira audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=NetworkManager-dispatcher comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jan 09 13:10:43 mekagojira dhclient[10973]: DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 15 (xid=0x72a3fc32)
Jan 09 13:10:44 mekagojira dhclient[7221]: DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 4 (xid=0x32509905)
Jan 09 13:10:48 mekagojira dhclient[7221]: DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 7 (xid=0x32509905)
Jan 09 13:10:55 mekagojira dhclient[7221]: DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 20 (xid=0x32509905)
Jan 09 13:10:58 mekagojira dhclient[10973]: DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 20 (xid=0x72a3fc32)
Jan 09 13:11:08 mekagojira NetworkManager[1064]: <warn> (enp3s0f1): DHCPv4 request timed out.
Jan 09 13:11:08 mekagojira NetworkManager[1064]: <info> (enp3s0f1): DHCPv4 state changed unknown -> timeout
Jan 09 13:11:08 mekagojira NetworkManager[1064]: <info> (enp3s0f1): canceled DHCP transaction, DHCP client pid 10973
Jan 09 13:11:08 mekagojira NetworkManager[1064]: <info> (enp3s0f1): DHCPv4 state changed timeout -> done
Jan 09 13:11:08 mekagojira NetworkManager[1064]: <info> (enp3s0f1): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
Jan 09 13:11:08 mekagojira NetworkManager[1064]: <warn> (enp3s0f1): Activation: failed for connection 'Wired connection 2'
Jan 09 13:11:08 mekagojira NetworkManager[1064]: <info> (enp3s0f1): device state change: failed -> disconnected (reason 'none') [120 30 0]
以下是单独运行 dhclient 的输出：
# dhclient -v enp3s0f1
Internet Systems Consortium DHCP Client 4.3.3
Copyright 2004-2015 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/enp3s0f1/b8:2a:72:a2:66:db
Sending on LPF/enp3s0f1/b8:2a:72:a2:66:db
Sending on Socket/fallback
DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 4 (xid=0x4b27e968)
DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 10 (xid=0x4b27e968)
DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 21 (xid=0x4b27e968)
DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 17 (xid=0x4b27e968)
DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 7 (xid=0x4b27e968)
DHCPDISCOVER on enp3s0f1 to 255.255.255.255 port 67 interval 2 (xid=0x4b27e968)
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
这是我所知道的（或者至少是猜测）：
- DHCP 服务器已启动，并且不拒绝 Linux 客户端，电缆也正常。我将其插入另一个运行 Ubuntu 15.10 的盒子并立即连接。
- 这台机器上的 NIC 很好。虽然 F23 实时映像的行为与安装类似（即无法连接），但 Ubuntu 实时映像连接得很好。
- 不是这个版本（或者只是这个版本）的内核。GRUB 菜单上的旧版本也无法连接。
我很困惑。有什么想法吗？
答案1
事实证明，现在有线连接失败，即使使用相同的 Ubuntu Live 映像，将其带回家并插入 Apple AirPort（没有任意拒绝通过有线以太网请求 DHCP 租户的历史）也会产生相同的结果，使用多条电缆。我将其归咎于硬件问题并关闭它。