I'll try to fix, on Debian Bullseye, this unstable connection with this ethernet card but I could not.
This is the card:
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02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
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sudo ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether a8:5e:45:a6:cf:ac brd ff:ff:ff:ff:ff:ff
inet 192.168.1.9/24 brd 192.168.1.255 scope global dynamic noprefixroute enp2s0
valid_lft 21283sec preferred_lft 21283sec
inet6 fe80::aa5e:45ff:fea6:cfac/64 scope link noprefixroute
valid_lft forever preferred_lft forever
cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
sudo dmesg | egrep 'enp2s0|r8169'
[ 1.342829] r8169 0000:02:00.0: can't disable ASPM; OS doesn't have ASPM control
[ 1.361695] libphy: r8169: probed
[ 1.361826] r8169 0000:02:00.0 eth0: RTL8168h/8111h, a8:5e:45:a6:cf:ac, XID 541, IRQ 125
[ 1.361828] r8169 0000:02:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
[ 1.362497] r8169 0000:02:00.0 enp2s0: renamed from eth0
[ 3.442507] r8169 0000:02:00.0: firmware: direct-loading firmware rtl_nic/rtl8168h-2.fw
[ 3.468268] Generic FE-GE Realtek PHY r8169-200:00: attached PHY driver [Generic FE-GE Realtek PHY] (mii_bus:phy_addr=r8169-200:00, irq=IGNORE)
[ 3.664540] r8169 0000:02:00.0 enp2s0: Link is Down
[ 7.301775] r8169 0000:02:00.0 enp2s0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 7.301792] IPv6: ADDRCONF(NETDEV_CHANGE): enp2s0: link becomes ready
[ 858.732448] r8169 0000:02:00.0 enp2s0: Link is Down
[ 867.815729] r8169 0000:02:00.0 enp2s0: Link is Up - 1Gbps/Full - flow control rx/tx
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sudo dmesg | egrep 'enp2s0|r8168'
[ 1.324632] r8168: loading out-of-tree module taints kernel.
[ 1.324723] r8168: module verification failed: signature and/or required key missing - tainting kernel
[ 1.325633] r8168 Gigabit Ethernet driver 8.048.03-NAPI loaded
[ 1.340065] r8168: This product is covered by one or more of the following patents: US6,570,884, US6,115,776, and US6,327,625.
[ 1.342069] r8168 Copyright (C) 2020 Realtek NIC software team <nicfae@realtek.com>
[ 1.342676] r8168 0000:02:00.0 enp2s0: renamed from eth0
[ 3.461416] enp2s0: 0xffffbb120003d000, a8:5e:45:a6:cf:ac, IRQ 123
[ 7.811982] r8168: enp2s0: link up
[ 7.811998] IPv6: ADDRCONF(NETDEV_CHANGE): enp2s0: link becomes ready
lsmod | grep r8168
r8168 569344 0
https://wiki.debian.org/rtl819x
Others pages viewed:
https://tuxbyte.com/how-to-get-your-rea ... ted-guide/
http://adam.rosi-kessel.org/weblog/2008 ... wn-problem
https://askubuntu.com/questions/1052971 ... e-troubles
https://forum.debianizzati.org/viewtopic.php?t=55207
http://forums.debian.net/search.php?st=0&sk=t&sd=d&sr=posts&keywords=realtek&start=45
I thought those issues with Realtek card were resolved... Anyway thanks in advance!!!