Public bug reported:
Tailscale connection fails for packets over a certain size on a new
motherboard with a specific NIC. The issue is host-specific as another
machine on the same LAN works (OpenBSD). The problem persists even with
hardware offloading disabled and in userspace-networking mode.
$ cat /proc/version_signature
Ubuntu 6.14.0-29.29~24.04.1-generic 6.14.8
$ tailscale --version
1.88.1
tailscale commit: 032962f4bc982fe8b6b58df01c33cf2904d07d67
long version: 1.88.1-t032962f4b-gc5ad3b22f
other commit: c5ad3b22fdb5813c46501f20144c6b29b61acf54
go version: go1.25.1
$ lspci -nnk | grep -i ethernet -A2
06:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8125
2.5GbE Controller [10ec:8125] (rev 0c)
DeviceName: Realtek RTL8125D LAN
Subsystem: ASUSTeK Computer Inc. RTL8125 2.5GbE Controller [1043:88e1]
$ ping -c 4 -s 1252 -M do <tailscale_ip>
fails over tailnet and
$ ssh <tailscale_ip>
hangs with KEXINIT
$ ethtool -k eno1
Features for eno1:
rx-checksumming: on
tx-checksumming: on
tx-checksum-ipv4: on
tx-checksum-ip-generic: off [fixed]
tx-checksum-ipv6: on
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
tx-tcp-segmentation: on
tx-tcp-ecn-segmentation: off [fixed]
tx-tcp-mangleid-segmentation: off
tx-tcp6-segmentation: on
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: on [fixed]
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-gre-csum-segmentation: off [fixed]
tx-ipxip4-segmentation: off [fixed]
tx-ipxip6-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
tx-udp_tnl-csum-segmentation: off [fixed]
tx-gso-partial: off [fixed]
tx-tunnel-remcsum-segmentation: off [fixed]
tx-sctp-segmentation: off [fixed]
tx-esp-segmentation: off [fixed]
tx-udp-segmentation: off [fixed]
tx-gso-list: off [fixed]
tx-nocache-copy: off
loopback: off [fixed]
rx-fcs: off
rx-all: off
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off [fixed]
hw-tc-offload: off [fixed]
esp-hw-offload: off [fixed]
esp-tx-csum-hw-offload: off [fixed]
rx-udp_tunnel-port-offload: off [fixed]
tls-hw-tx-offload: off [fixed]
tls-hw-rx-offload: off [fixed]
rx-gro-hw: off [fixed]
tls-hw-record: off [fixed]
rx-gro-list: off
macsec-hw-offload: off [fixed]
rx-udp-gro-forwarding: off
hsr-tag-ins-offload: off [fixed]
hsr-tag-rm-offload: off [fixed]
hsr-fwd-offload: off [fixed]
hsr-dup-offload: off [fixed]
$ lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04.3 LTS
Release: 24.04
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "lspci output"
https://bugs.launchpad.net/bugs/2125547/+attachment/5911246/+files/lspci-vnvn.log
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https://bugs.launchpad.net/bugs/2125547
Title:
[Kernel 6.14] Tailscale/WireGuard packet loss >1200 bytes on Realtek
RTL8125 2.5GbE (ASUS X870)
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