Can't get or assign IP address to NIC

[kkremitzki]

Hi, I have a bit of a tricky problem with a NIC that I could use some help diagnosing. This is on a fairly fresh Proxmox install which I happen to have PCI passthrough set up on (a TV tuner card to a VM running MythTV) and I almost wonder if that's related. That, or hardware failure, I can't imagine what else.

This PCI NIC has two ports, enp3s0 and enp4s0, with the same behavior on both. I have this in my /etc/network/interfaces:

auto enp4s0
iface enp4s0 inet dhcp

However,

$ ip address show enp4s0
3: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 68:1c:a2:12:57:ec brd ff:ff:ff:ff:ff:ff
    inet6 fe80::6a1c:a2ff:fe12:57ec/64 scope link
       valid_lft forever preferred_lft forever

No IP as you can see... this is with a known-good ethernet cable on a network with working DHCP (dnsmasq). Checking the logs there, I see e.g.

Jan 23 22:20:49 dnsmasq-dhcp[1107]: DHCPDISCOVER(ens18) 88:96:4e:43:ab:e2
Jan 23 22:20:49 dnsmasq-dhcp[1107]: DHCPOFFER(ens18) 192.168.1.248 88:96:4e:43:ab:e2
Jan 23 22:20:49 dnsmasq-dhcp[1107]: DHCPDISCOVER(ens18) 88:96:4e:43:ab:e2
Jan 23 22:20:49 dnsmasq-dhcp[1107]: DHCPOFFER(ens18) 192.168.1.248 88:96:4e:43:ab:e2

which is the wrong MAC address, but with the same timing as my running ip link set enp4s0 down & up.

Changing /etc/network/interfaces to specify a static IP address also doesn't work:

auto enp4s0
iface enp4s0 inet static
        address 192.168.1.15/24
        gateway 192.168.1.254

I run ip link set enp4s0 down and then up

The link itself seems fine

$ sudo ethtool enp4s0
Settings for enp4s0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Half 1000baseT/Full
        Link partner advertised pause frame use: No
        Link partner advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000033 (51)
                               drv probe ifdown ifup
        Link detected: yes

So I'm not sure what else to try. Any suggestions?

 

[Richard]

Without PCI pass-through it works? And what's ens18?