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FS#1909 - failsafe packet sent to udp/4919 on WAN port does not match interface MAC after boot #6822

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openwrt-bot opened this issue Oct 27, 2018 · 0 comments
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tamsky:

  • Device problem occurs on

Device tested: Archer C7 v2

  • Software versions of OpenWrt/LEDE release, packages, etc.

Tested on Chaos Calmer 15.06, and on 18.06

  • Steps to reproduce

packet sniff WAN port during power on
src MAC address of failsafe broadcast notification packet (sent to udp/4919) has a different MAC address than the final configured default MAC address for the WAN port after boot.

This causes issues with some ARRIS cable modem devices with a configured max client count of 1.

  • Observed values

src MAC address of broadcast failsafe packet on the WAN port matches the LAN switch MAC.

  • Suggested possible next actions:
  1. Use the WAN switch MAC address for the broadcast packet, on all interfaces, which should be safe.
  2. If 1. is infeasible, provide a /etc/config/... setting that disables the sending of the udp/4919 packet -- which is not critical to experienced operators.
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