I updated my Debian Jessie installation a few days ago to the current minor version (8.3), which included a new Linux kernel (uname -a gives 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u3 (2016-01-17) x86_64 GNU/Linux). Since then, I haven't been able to connect to the Internet, which previously had not been a problem. The same ethernet cable and port quickly connects to the Internet (using DHCP) if I plug it into a Macbook or even an ancient CentOS machine, so the problem must be in the Debian configuration. I'm at a loss for what to do though. I tried different combinations of DHCP or static IP (using the IP address and settings obtained with DHCP on the other machines), and ifupdown or network-manager, along with several reboots, all to no avail. DHCP fails either silently or with a message about not obtaining a lease. With a static IP, the ethernet device shows up as connected, but in fact there is no connection to the Internet. Any ideas for how to go about troubleshooting?
Edit: Here are the lines that seem possibly relevant in /var/log/dmesg [eth1 is the right port]:
[ 16.480813] ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 18.031149] tg3 0000:08:00.0: eth1: Link is up at 100 Mbps, full duplex
[ 18.031151] tg3 0000:08:00.0: eth1: Flow control is off for TX and off for RX
[ 18.031881] ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[ 28.240006] eth1: no IPv6 routers present
Output of nmcli -p -f general device show eth1:
===============================================================================
Device details (eth1)
===============================================================================
GENERAL.DEVICE: eth1
GENERAL.TYPE: ethernet
GENERAL.VENDOR: Broadcom Corporation
GENERAL.PRODUCT: NetXtreme BCM5754 Gigabit Ethernet PCI Express (Precision T5400)
GENERAL.DRIVER: tg3
GENERAL.DRIVER-VERSION: 3.137
GENERAL.FIRMWARE-VERSION: 5754-v3.24
GENERAL.HWADDR: 00:21:9B:41:28:86
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.REASON: 0 (No reason given)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:1c.0/0000:08:00.0/net/eth1
GENERAL.IP-IFACE: eth1
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.CONNECTION: eth1
GENERAL.CON-UUID: c81bfd1d-5dad-4ba0-9160-b6dba7ea325a
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/2
Output of ethtool eth1:
Settings for eth1:
Supported ports: [ TP ]
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/Half 1000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: No
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: off
Supports Wake-on: g
Wake-on: g
Current message level: 0x000000ff (255)
drv probe link timer ifdown ifup rx_err tx_err
Link detected: yes
Output of lsmod | grep tg3:
tg3 164481 0
ptp 17692 1 tg3
libphy 32268 1 tg3
Output of lspci | grep -i ethernet:
08:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5754 Gigabit Ethernet PCI Express (rev 02)
Output of cat /var/log/kern.log | grep -i tg:
May 15 12:00:14 kernel: [ 2.587463] tg3.c:v3.116 (December 3, 2010)
May 15 12:00:14 kernel: [ 2.587482] tg3 0000:08:00.0: PCI INT A -> GSI
16 (level, low) -> IRQ 16
May 15 12:00:14 kernel: [ 2.587491] tg3 0000:08:00.0: setting latency
timer to 64
May 15 12:00:14 kernel: [ 2.604699] tg3 0000:08:00.0: eth0: Tigon3 [pa
rtno(BCM95754) rev b002] (PCI Express) MAC address 00:21:9b:41:28:86
May 15 12:00:14 kernel: [ 2.604702] tg3 0000:08:00.0: eth0: attached P
HY is 5787 (10/100/1000Base-T Ethernet) (WireSpeed[1])
May 15 12:00:14 kernel: [ 2.604704] tg3 0000:08:00.0: eth0: RXcsums[1]
LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
May 15 12:00:14 kernel: [ 2.604706] tg3 0000:08:00.0: eth0: dma_rwctrl
[76180000] dma_mask[64-bit]
May 15 12:00:14 kernel: [ 13.668551] tg3 0000:08:00.0: irq 78 for MSI/M
SI-X
May 15 12:00:14 kernel: [ 15.265188] tg3 0000:08:00.0: eth1: Link is up
at 100 Mbps, full duplex
May 15 12:00:14 kernel: [ 15.265190] tg3 0000:08:00.0: eth1: Flow contr
ol is off for TX and off for RX
output of ethtool -S eth1:
NIC statistics:
rx_octets: 1351463
rx_fragments: 0
rx_ucast_packets: 0
rx_mcast_packets: 1051
rx_bcast_packets: 8167
rx_fcs_errors: 0
rx_align_errors: 0
rx_xon_pause_rcvd: 0
rx_xoff_pause_rcvd: 0
rx_mac_ctrl_rcvd: 0
rx_xoff_entered: 0
rx_frame_too_long_errors: 0
rx_jabbers: 0
rx_undersize_packets: 0
rx_in_length_errors: 0
rx_out_length_errors: 0
rx_64_or_less_octet_packets: 0
rx_65_to_127_octet_packets: 0
rx_128_to_255_octet_packets: 0
rx_256_to_511_octet_packets: 0
rx_512_to_1023_octet_packets: 0
rx_1024_to_1522_octet_packets: 0
rx_1523_to_2047_octet_packets: 0
rx_2048_to_4095_octet_packets: 0
rx_4096_to_8191_octet_packets: 0
rx_8192_to_9022_octet_packets: 0
tx_octets: 106305
tx_collisions: 0
tx_xon_sent: 0
tx_xoff_sent: 0
tx_flow_control: 0
tx_mac_errors: 0
tx_single_collisions: 0
tx_mult_collisions: 0
tx_deferred: 0
tx_excessive_collisions: 0
tx_late_collisions: 0
tx_collide_2times: 0
tx_collide_3times: 0
tx_collide_4times: 0
tx_collide_5times: 0
tx_collide_6times: 0
tx_collide_7times: 0
tx_collide_8times: 0
tx_collide_9times: 0
tx_collide_10times: 0
tx_collide_11times: 0
tx_collide_12times: 0
tx_collide_13times: 0
tx_collide_14times: 0
tx_collide_15times: 0
tx_ucast_packets: 492
tx_mcast_packets: 30
tx_bcast_packets: 995
tx_carrier_sense_errors: 0
tx_discards: 0
tx_errors: 0
dma_writeq_full: 0
dma_write_prioq_full: 0
rxbds_empty: 0
rx_discards: 0
rx_errors: 0
rx_threshold_hit: 0
dma_readq_full: 0
dma_read_prioq_full: 0
tx_comp_queue_full: 0
ring_set_send_prod_index: 0
ring_status_update: 0
nic_irqs: 0
nic_avoided_irqs: 0
nic_tx_threshold_hit: 0
mbuf_lwm_thresh_hit: 0
output of iptables -vL:
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
/var/log/dmesg. Debian currently has 4.3 and 4.5 kernel images available. It seems unlikely the kernel is the problem, but it doesn't hurt to try. If you want to hop into the main chat room, it might facilitate debugging. You can ping me there if you want.iptables -vLto check) that might be blocking connectivity?