[SOLVED] Failed LAN ethernet connection

ethereal1m · 10-22-2019, 10:27 AM

Dear all,
for some reason my ethernet cable LAN connection failed but my WIFI USB connection works fine. I thought I had a bad ethernet port, until I tried to use USB-ethernet-LAN connection, it gave same error:

Code:

Oct 22 22:16:42 serenity dhclient[29174]: DHCPDISCOVER on enx00e04c534458 to 255.255.255.255 port 67 interval 4 (xid=0x52509919)
Oct 22 22:16:46 serenity dhclient[29174]: DHCPDISCOVER on enx00e04c534458 to 255.255.255.255 port 67 interval 7 (xid=0x52509919)
Oct 22 22:16:53 serenity dhclient[29174]: DHCPDISCOVER on enx00e04c534458 to 255.255.255.255 port 67 interval 20 (xid=0x52509919)
Oct 22 22:17:01 serenity CRON[29189]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Oct 22 22:17:13 serenity dhclient[29174]: DHCPDISCOVER on enx00e04c534458 to 255.255.255.255 port 67 interval 20 (xid=0x52509919)
Oct 22 22:17:24 serenity NetworkManager[961]: <warn>  [1571757444.8783] dhcp4 (enx00e04c534458): request timed out
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.8784] dhcp4 (enx00e04c534458): state changed unknown -> timeout
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9105] dhcp4 (enx00e04c534458): canceled DHCP transaction, DHCP client pid 29174
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9106] dhcp4 (enx00e04c534458): state changed timeout -> done
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9109] device (enx00e04c534458): state change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed')
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9114] manager: NetworkManager state is now DISCONNECTED
Oct 22 22:17:24 serenity NetworkManager[961]: <warn>  [1571757444.9118] device (enx00e04c534458): Activation: failed for connection 'Wired connection 2'
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9122] device (enx00e04c534458): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
Oct 22 22:17:24 serenity kernel: [20502.085126] audit: type=1400 audit(1571757444.909:123): apparmor="DENIED" operation="open" profile="snap.firefox.firefox" name="/proc/3737/net/if_inet6" pid=3737 comm=4C696E6B204D6F6E69746F72 requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Oct 22 22:17:24 serenity avahi-daemon[935]: Withdrawing address record for fe80::6e5d:2f9c:4e42:ee95 on enx00e04c534458.
Oct 22 22:17:24 serenity avahi-daemon[935]: Leaving mDNS multicast group on interface enx00e04c534458.IPv6 with address fe80::6e5d:2f9c:4e42:ee95.
Oct 22 22:17:24 serenity avahi-daemon[935]: Interface enx00e04c534458.IPv6 no longer relevant for mDNS.
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9155] policy: auto-activating connection 'Wired connection 2' (ae0863eb-c2c4-3ccf-adde-26bbfce99475)
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9166] device (enx00e04c534458): Activation: starting connection 'Wired connection 2' (ae0863eb-c2c4-3ccf-adde-26bbfce99475)
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9169] device (enx00e04c534458): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9181] manager: NetworkManager state is now CONNECTING
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9186] device (enx00e04c534458): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9418] device (enx00e04c534458): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9423] dhcp4 (enx00e04c534458): activation: beginning transaction (timeout in 45 seconds)
Oct 22 22:17:24 serenity NetworkManager[961]: <info>  [1571757444.9441] dhcp4 (enx00e04c534458): dhclient started with pid 29201

what could be the problem?

regards

berndbausch · 10-22-2019, 02:43 PM

Quote:

Originally Posted by ethereal1m

Code:

Oct 22 22:16:42 serenity dhclient[29174]: DHCPDISCOVER on enx00e04c534458 to 255.255.255.255 port 67 interval 4 (xid=0x52509919)
Oct 22 22:16:46 serenity dhclient[29174]: DHCPDISCOVER on enx00e04c534458 to 255.255.255.255 port 67 interval 7 (xid=0x52509919)
Oct 22 22:16:53 serenity dhclient[29174]: DHCPDISCOVER on enx00e04c534458 to 255.255.255.255 port 67 interval 20 (xid=0x52509919)
Oct 22 22:17:01 serenity CRON[29189]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Oct 22 22:17:13 serenity dhclient[29174]: DHCPDISCOVER on enx00e04c534458 to 255.255.255.255 port 67 interval 20 (xid=0x52509919)
Oct 22 22:17:24 serenity NetworkManager[961]: <warn>  [1571757444.8783] dhcp4 (enx00e04c534458): request timed out

what could be the problem?

DHCP server not reachable, or it ignores this MAC address.

frankbell · 10-22-2019, 08:09 PM

Since you didn't mention it, I must ask, did you test the cable and try a different port on the router/hub/switch?

Can you ping the router/hub/switch and ping another device on your LAN, if one is present?

ethereal1m · 10-22-2019, 09:29 PM

The cable and ethernet port and its routers were working, I was able to connect it with other computer and its LAN.

Quote:

DHCP server not reachable, or it ignores this MAC address

yeah, I noticed that. How were it not reachable by this device but it was reachable by other? Could it be a hardware problem?

berndbausch · 10-22-2019, 09:57 PM

Set an IP address manually and check connectivity to the DHCP server.

If there is connectivity, check if the DHCP server is configured to serve this client.

ethereal1m · 10-25-2019, 11:27 PM

it appears that the problem lies in the port or the router. Nothing to do with my Linux. Case closed.