Edgerouter x sfp does not accept dhcp offer from sfp(eth5) port

Installing and Using OpenWrt Network and Wireless Configuration
1

Hello all,

I am trying to use the sfp port as my upstream connection.

As I understood this is eth5.

Currently ER-X runs 23.03.2 with defaults except for:

  • packages: luci...attended-sysupgrades, tcpdump
  • minimal config changes:
  • router name
  • password
  • moved WAN/6 from eth1 to eth5

Behavior of WAN/6:

  • on eth1 as expected gets IPv4/6 from the DHCP server
  • on eth5 i see the the discover and offer packets both on the DHCP server and on ER-X (remote wireshark)

Net setup for tests:

  • DHCP server on 192.168.3.0/24 running OpenWrt 21.02.0, r16279-5cc0535800 and pc on this network
  • ER-X local net as default on 192.168.1.0/24 with another pc for configuring

Any hints on how to approach the problem because it seems that the offer packets reach ER-X but the client refuses them or they are dropped by the kernel

2

Only from erx, other you said sends receives ok.

Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:
grafik
Remember to redact passwords, MAC addresses and any public IP addresses you may have:

ubus call system board
cat /etc/config/network
cat /etc/config/wireless
cat /etc/config/dhcp
cat /etc/config/firewall
1 Like
3

Did you also remove the lan connection to eth5?

2 Likes
4

Thank you very much.
indeed forgot about br-lan
now works as expected