pfSense on an 82599 (X520 clone) cannot negotiate 2.5G with an SFP+ RJ45 module to a cable modem
A pfSense router on a Supermicro R210 II with an AOC-STGN-i2S (82599-based X520 clone) was connected throguh an FS.com SFP+-to-RJ45 module to a cable modem with a 2.5 Gbps port. No link negotiation happened; pfSense offered only auto and 10G speeds and never 2.5G. Hardware involved: Supermicro AOC-STGN-i2S (Intel 82599), Intel X550, FS.com SFP+ to RJ45 10GBASE-T.
- Hardware: Supermicro AOC-STGN-i2S (Intel 82599), Intel X550
- Transceivers: FS.com SFP+ to RJ45 10GBASE-T
- Form factor: SFP+
Symptoms / messages:
no link at 2.5G
only 10G/auto offered
Also available in: English
العربية
Deutsch
Español
Français
हिन्दी
Bahasa Indonesia
Italiano
日本語
한국어
Nederlands
Polski
Português
Русский
Türkçe
Tiếng Việt
简体中文
Comments 1
The 82599 only supports 1G and 10G and SFP+ has no copper-style auto-negotiation; many RJ45 modules do not support NBASE-T, so force 1G, use an X550-class NIC, or add a cheap 2.5G PCIe card (RTL8125).