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As in the title. I can ping local networks, but there will be 10 packets in a row that would be lost, and the connection is very slow. There is no access to anything outside the network, including the default gateway, both when pinging IP and by domain name.

Using the step-by-step analysis here, I can't do anything after step 2. All other devices on the network work perfectly fine using that same ethernet cable.

I suppose the problem is two-fold: why is there packet loss on local network, and why can it not reach the external network? It's an old computer that I am just interacting with recently and seems to have a lot tampered with.

Ip route (eth0 is the one I am using for the web):

ip route
default via 192.168.1.1 dev eth0
10.0.0.0/16 dev eth1  proto kernel  scope link  src 10.0.0.2
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.97

Ip addr - the .97 is static and the .117 was set by dhcp

ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:07:32:8f:ec:be brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.97/24 brd 192.168.1.255 scope global eth0:0
    inet 192.168.1.117/24 brd 192.168.1.255 scope global secondary eth0
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:07:32:8f:ec:bf brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.2/16 brd 10.0.255.255 scope global eth1

EDIT: ethtool

Settings for eth0:
        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: Symmetric
        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

ethtool -S eth0

NIC statistics:
     tx_packets: 1847873
     rx_packets: 8265
     tx_errors: 0
     rx_errors: 0
     rx_missed: 0
     align_errors: 0
     tx_single_collisions: 0
     tx_multi_collisions: 0
     unicast: 343
     broadcast: 5915
     multicast: 2007
     tx_aborted: 0
     tx_underrun: 0
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17
  • what if you reduce to number of IP addresses on eth0 to one? does it fix any of the issues? side note: that's amazing, what are the chances that your two NICs are 00:07:32:8f:ec:be and 00:07:32:8f:ec:bf!
    – Jaromanda X
    Commented Jan 2, 2023 at 21:32
  • If I comment out the static IP 192.168.1.97 , the dhcp auto-setup doesn't work at all, so there is no internet connection. Evidently some way the settings are set up rely on the .97 address
    – Cheetaiean
    Commented Jan 2, 2023 at 21:45
  • what if you prevent the "DHCP auto-setup" instead of removing the static IP - or, remove one of the IP's manually
    – Jaromanda X
    Commented Jan 2, 2023 at 22:01
  • Well then the situation remains the same. The only IP on eth0 is the static 192.168.1.97 with the same limitations as described in my original post.
    – Cheetaiean
    Commented Jan 2, 2023 at 22:06
  • 1
    Are you sure there's no IP conflict ? Did you checked your MTU ?
    – binarym
    Commented Jan 2, 2023 at 23:10

1 Answer 1

Reset to default
0

There was a duplicate IP issue - in the IP Bind settings of my router the static IP I was setting my system to was registered to a different MAC address.

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