DS420+ does not recognize 2.5GB USB Ethernet Adapter

[YonnJungpapa]

Description of the problem

Hello, I'm attempting to use two 2.5G adapters on my DS420+ but only one interface is recognized, leaving me in need of assistance.

I've inserted USB LAN adapters into the USB 3.0 ports on both the front and back of the NAS, but only one side is recognized while the other isn't.

These USB LAN adapters are recognized well on my PC. Even when I insert one adapter through a USB hub, it still doesn't get recognized.

I'd appreciate any help.

Description of your products

Model: DS420+
CPU: Intel Celeron J4025
DSM Version: DSM 7.2.1-69057 Update 5
Ethernet dongle product name: NEXT-2501GU3

Description of your environment

Ethernet switch: TRENDnet 8-Port Unmanaged 2.5G Switch
I access the NAS through an Ethernet switch. Both the NAS and laptop are using Cat8 cables and 2.5G USB Ethernet Adapters.
All the 2.5G USB Ethernet Adapters I have are functioning properly when connected to a PC.

Output of dmesg command

dmesg.txt

Output of lsusb command

|__usb1 1d6b:0002:0404 09 2.00 480MBit/s 0mA 1IF (Linux 4.4.302+ xhci-hcd xHCI Host Controller 0000:00:15.0) hub
|__1-4 f400:f400:0100 00 2.00 480MBit/s 200mA 1IF (Synology DiskStation 7F00124B05CC4565)
|__usb2 1d6b:0003:0404 09 3.00 5000MBit/s 0mA 1IF (Linux 4.4.302+ xhci-hcd xHCI Host Controller 0000:00:15.0) hub
|__2-1 0bda:8156:3100 00 3.20 5000MBit/s 256mA 1IF (Realtek USB 10/100/1G/2.5G LAN 001000001)
|__2-2 0bda:8156:3100 00 3.20 5000MBit/s 256mA 1IF (Realtek USB 10/100/1G/2.5G LAN 001000000)

Output of ifconfig -a command

eth0 Link encap:Ethernet HWaddr 00:11:32:EB:E2:17
inet addr:172.30.1.30 Bcast:172.30.1.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:88 base 0xc000

eth1 Link encap:Ethernet HWaddr 00:11:32:EB:E2:18
inet addr:172.30.1.40 Bcast:172.30.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:368396 errors:0 dropped:0 overruns:0 frame:0
TX packets:907339 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:27684184 (26.4 MiB) TX bytes:2984363908 (2.7 GiB)
Interrupt:89 base 0xe000

eth2 Link encap:Ethernet HWaddr 00:E0:4C:68:13:2D
inet addr:172.30.1.42 Bcast:172.30.1.255 Mask:255.255.255.0
inet6 addr: fe80::2e0:4cff:fe68:132d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1
RX packets:14850 errors:0 dropped:0 overruns:0 frame:0
TX packets:7038 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4749960 (4.5 MiB) TX bytes:1017843 (993.9 KiB)

eth3 Link encap:Ethernet HWaddr 00:E0:4C:68:11:E4
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:144103 errors:0 dropped:0 overruns:0 frame:0
TX packets:144103 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:24187383 (23.0 MiB) TX bytes:24187383 (23.0 MiB)

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

Output of ethtool eth3 command

Settings for eth3:
Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
2500baseX/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
2500baseX/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Link partner advertised pause frame use: No
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: Unknown!
Duplex: Unknown! (255)
Port: MII
PHYAD: 32
Transceiver: internal
Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00007fff (32767)
drv probe link timer ifdown ifup rx_err tx_err tx _queued intr tx_done rx_status pktdata hw wol
Link detected: no

Output of dmesg command(After connecting the LAN adapter with the cable)

[50851.378202] r8152 2-1:1.0 eth2: carrier on
[50852.861994] audit_printk_skb: 252 callbacks suppressed
[50852.867741] audit: type=1325 audit(1715665537.891:1614): table=filter family=2 entries=34
[50852.882575] audit: type=1325 audit(1715665537.912:1615): table=filter family=2 entries=35
[50854.268463] Synotify use 16384 event queue size
[50856.953682] audit: type=1325 audit(1715665541.983:1616): table=filter family=2 entries=36
[50856.981282] audit: type=1325 audit(1715665542.011:1617): table=filter family=2 entries=36
[50857.014432] audit: type=1325 audit(1715665542.044:1618): table=filter family=2 entries=36
[50857.028546] audit: type=1325 audit(1715665542.058:1619): table=filter family=10 entries=62
[50857.042547] audit: type=1325 audit(1715665542.072:1620): table=filter family=10 entries=62
[50857.056792] audit: type=1325 audit(1715665542.086:1621): table=filter family=10 entries=62
[50857.071054] audit: type=1325 audit(1715665542.101:1622): table=filter family=2 entries=40
[50857.085038] audit: type=1325 audit(1715665542.115:1623): table=filter family=10 entries=66

Output of lsmod command

Module Size Used by
tun 19836 0
ipt_MASQUERADE 1341 0
xt_REDIRECT 1550 0
nf_nat_masquerade_ipv4 2109 1 ipt_MASQUERADE
xt_nat 2091 0
iptable_nat 2023 0
nf_nat_ipv4 4839 1 iptable_nat
nf_nat_redirect 1395 1 xt_REDIRECT
nf_nat 10897 4 nf_nat_redirect,nf_nat_ipv4,xt_nat,nf_nat_masque rade_ipv4
fuse 87662 1
r8152 223165 0
vfat 10511 0
fat 55795 1 vfat
vhost_scsi 28995 1
vhost 30822 1 vhost_scsi
tcm_loop 15357 1
iscsi_target_mod 272697 1
target_core_user 27400 0
target_core_ep 50980 2
target_core_multi_file 29151 1
target_core_file 59354 1
target_core_iblock 17374 1
target_core_mod 893656 22 target_core_iblock,target_core_multi_file,vhost ,iscsi_target_mod,target_core_ep,target_core_file,target_core_user,vhost_scsi,tc m_loop
syno_extent_pool 1385313 0
rodsp_ep 91947 3 target_core_multi_file,syno_extent_pool,target_c ore_file
udf 80886 0
isofs 33143 0
synoacl_vfs 16969 1
xt_conntrack 3407 4
xt_mac 1283 0
xt_geoip 3463 0
compat_xtables 1083 0
nf_conntrack_ipv6 6656 2
nf_defrag_ipv6 6487 1 nf_conntrack_ipv6
ip6table_filter 1596 1
ip6_tables 14677 13 ip6table_filter
xt_recent 8685 0
xt_iprange 1776 2
xt_limit 2093 0
xt_state 1539 0
xt_tcpudp 2607 12
xt_multiport 1958 36
xt_LOG 1551 0
nf_conntrack_ipv4 11666 3
nf_defrag_ipv4 1539 1 nf_conntrack_ipv4
nf_conntrack 62242 7 nf_nat,xt_state,nf_nat_ipv4,xt_conntrack,nf_nat_ masquerade_ipv4,nf_conntrack_ipv4,nf_conntrack_ipv6
iptable_filter 1656 1
ip_tables 14150 2 iptable_filter,iptable_nat
x_tables 17075 17 ip6table_filter,xt_iprange,xt_recent,ip_tables, xt_tcpudp,ipt_MASQUERADE,xt_geoip,xt_limit,xt_state,xt_conntrack,xt_LOG,xt_mac,x t_nat,xt_multiport,iptable_filter,xt_REDIRECT,ip6_tables
raid456 115182 1
async_raid6_recov 5470 1 raid456
async_memcpy 1790 2 raid456,async_raid6_recov
async_pq 4932 2 raid456,async_raid6_recov
async_xor 3553 3 async_pq,raid456,async_raid6_recov
async_tx 2161 5 async_pq,raid456,async_xor,async_memcpy,async_ra id6_recov
8021q 17933 0
uas 13557 0
usb_storage 52935 1 uas
leds_lp3943 4918 0
aesni_intel 175290 1
glue_helper 4085 1 aesni_intel
lrw 3744 1 aesni_intel
gf128mul 5752 1 lrw
ablk_helper 2076 1 aesni_intel
syno_hddmon 2177 0
geminilake_synobios 83051 0
hid_generic 1385 0
usbhid 26542 0
hid 91650 2 hid_generic,usbhid
usblp 11290 0
zram 18699 2
i915 1293580 0
drm_kms_helper 121062 1 i915
syscopyarea 3198 1 drm_kms_helper
sysfillrect 3668 1 drm_kms_helper
sysimgblt 2367 1 drm_kms_helper
fb_sys_fops 1442 1 drm_kms_helper
cfbfillrect 3860 1 drm_kms_helper
cfbcopyarea 3390 1 drm_kms_helper
cfbimgblt 2367 1 drm_kms_helper
drm 310678 3 i915,drm_kms_helper
drm_panel_orientation_quirks 3729 1 drm
iosf_mbi 4298 1 i915
fb 34821 2 i915,drm_kms_helper
fbdev 1094 1 fb
video 27104 1 i915
backlight 6324 2 i915,video
button 5161 1 i915
i2c_algo_bit 5812 1 i915
uhci_hcd 22005 0
ehci_pci 4127 0
ehci_hcd 43205 1 ehci_pci
r8168 540240 0
dm_crypt 18450 0
sg 26471 0
dm_snapshot 29850 0
dm_bufio 14399 1 dm_snapshot
crc_itu_t 1595 1 udf
crc_ccitt 1595 0
psnap 2004 0
p8022 1307 0
llc 3569 2 p8022,psnap
hfsplus 92606 0
md4 3889 0
hmac 3089 0
sit 15976 0
tunnel4 2389 1 sit
ipv6 318022 82 sit,nf_defrag_ipv6,nf_conntrack_ipv6
flashcache_syno 270416 1
flashcache 81203 0
syno_flashcache_control 1231 2 flashcache_syno,flashcache
dm_mod 90426 12 flashcache_syno,dm_bufio,dm_crypt,flashcache,dm _snapshot
arc4 2168 0
crc32c_intel 13333 0
cryptd 8677 2 aesni_intel,ablk_helper
ecb 2241 0
aes_x86_64 7567 1 aesni_intel
authenc 4209 0
des_generic 16285 0
ansi_cprng 4020 0
cts 4520 0
md5 2705 0
cbc 2776 0
cpufreq_powersave 1190 0
cpufreq_performance 1194 2
acpi_cpufreq 6651 0
processor 26463 3 acpi_cpufreq
cpufreq_stats 2895 0
vxlan 33429 0
ip6_udp_tunnel 1967 1 vxlan
udp_tunnel 2419 1 vxlan
ip_tunnel 12142 1 sit
loop 19321 0
btrfs 1283822 1
raid6_pq 97268 4 async_pq,raid456,btrfs,async_raid6_recov
xor 10808 2 btrfs,async_xor
zstd_compress 154833 1 btrfs
zstd_decompress 60974 1 btrfs
ecryptfs 85159 1 btrfs
xxhash 4611 2 zstd_compress,zstd_decompress
sha256_generic 10665 0
synorbd 81247 0
synofsbd 29052 0
etxhci_hcd 84564 0
xhci_pci 4820 0
xhci_hcd 111198 1 xhci_pci
usbcore 209065 11 uas,etxhci_hcd,r8152,usblp,uhci_hcd,usb_storage ,ehci_hcd,ehci_pci,usbhid,xhci_hcd,xhci_pci
usb_common 2881 1 usbcore

[sammam2]

Did you check the Troubleshooting page?
https://github.com/bb-qq/r8152/wiki/Troubleshooting#performance-issues

Other Issues / Tips
Hot plugging does not work
The hot plug feature is disabled by default. To enable it, execute the following command:

sudo bash /var/packages/r8152/scripts/install-udev-rules

Note: This command modifies the system files of the DSM. Uninstalling the driver package will discard that change.

Multiple identical devices do not work
Please enable the hot plug feature described above.

Since the same products have the same serial number, connecting them to one NAS at the same time will trigger the workaround process of the Linux kernel. This will prevent recognition. Using the hot plug feature avoids this problem.

This is not a problem when combining different products.