CentOS 7.5 NIC Link is Down, NIC Link is 100 Mbps Full Deplex

HP 레이저 프린터 USB포트 불량으로 USB연결시 알수없는장치 라고 표기됩니다.

LPT로 테스트해보니 정상작동하는 프린터입니다.

요즘에 LPT가 있는 컴퓨터도 없고 젠더를 이용해서 사용가능하지만 이왕 이렇게 된거 프린터 서버로 활용을 해봅니다.

CentOS 7.5 + CUPS(HPLIP) + Samba로 구성하고 테스트해봅니다.

로그확인중 NIC링크 다운로그가 꾸준히 발생합니다.

 

 

 

증상

/var/log/message 오류 로그를 발생합니다.

이더넷 다운&업.. 계속 발생합니다.

10Mbps업 100Mbps 업 들쑥날쑥

랜선, 허브교체 해봤지만 동일증상 계속 발생합니다.

 

 

 

 

 

Oct 11 04:19:10 pserver kernel: e1000e: enp0s25 NIC Link is Down

Oct 11 04:19:12 pserver kernel: e1000e: enp0s25 NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx/Tx

Oct 11 04:19:12 pserver kernel: e1000e 0000:00:19.0 enp0s25: 10/100 speed: disabling TSO

Oct 11 04:19:12 pserver NetworkManager[723]: <info> [1602357552.8151] device (enp0s25): carrier: link connected

Oct 11 04:25:42 pserver kernel: e1000e: enp0s25 NIC Link is Down

Oct 11 04:25:43 pserver kernel: e1000e: enp0s25 NIC Link is Up 10 Mbps Full Duplex, Flow Control: Rx/Tx

Oct 11 04:25:43 pserver kernel: e1000e 0000:00:19.0 enp0s25: 10/100 speed: disabling TSO

Oct 11 04:25:43 pserver NetworkManager[723]: <info> [1602357943.8390] device (enp0s25): carrier: link connected

Oct 11 04:28:28 pserver kernel: e1000e: enp0s25 NIC Link is Down

Oct 11 04:28:31 pserver kernel: e1000e: enp0s25 NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx/Tx

Oct 11 04:28:31 pserver kernel: e1000e 0000:00:19.0 enp0s25: 10/100 speed: disabling TSO

Oct 11 04:28:31 pserver NetworkManager[723]: <info> [1602358111.1061] device (enp0s25): carrier: link connected

Oct 11 05:01:01 pserver systemd: Started Session 134 of user root.

Oct 11 05:10:51 pserver kernel: e1000e: enp0s25 NIC Link is Down

Oct 11 05:10:53 pserver kernel: e1000e: enp0s25 NIC Link is Up 10 Mbps Full Duplex, Flow Control: Rx/Tx

Oct 11 05:10:53 pserver kernel: e1000e 0000:00:19.0 enp0s25: 10/100 speed: disabling TSO

Oct 11 05:10:53 pserver NetworkManager[723]: <info> [1602360653.2061] device (enp0s25): carrier: link connected

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https://prettycode.tistory.com

 

해결

1Gbps지원하는 이더넷입니다.

하지만 사무실에 100Mbps로 구성되어 있어서 충돌인것 같습니다.

해결방법은 강제로 100Mbps로 지정하고, autoneg off로 허브와 통신속도와 통신방식을 자동으로 맟추는 기능 off

# vi /etc/sysconfig/network-scripts/ifcfg-enp0s25

# systemctl restart network.service 
or
# reboot

 

 

TYPE=Ethernet

PROXY_METHOD=none

BROWSER_ONLY=no

BOOTPROTO=none

DEFROUTE=yes

IPV4_FAILURE_FATAL=no

IPV6INIT=yes

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_FAILURE_FATAL=no

IPV6_ADDR_GEN_MODE=stable-privacy

NAME=enp0s25

UUID=ssd89d86-a497-476d-b1d3-ec1f23e3f1f2

DEVICE=enp0s25

ONBOOT=yes

IPADDR=xxx.xxx.xxx.xxx

PREFIX=24

GATEWAY=xxx.xxx.xxx.xxx

DNS1=xxx.xxx.xxx.xxx

ETHTOOL_OPTS="speed 100 duplex full autoneg off"

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https://prettycode.tistory.com