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Fixes an assertion failure in LwIP DHCP code when receiving an offer with > 2 DNS servers #1618

merged 2 commits into from Dec 3, 2018


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avtolstoy commented Dec 3, 2018


Xenons with Ethernet FeatherWing and Argons go into panic state due to an assertion failure in LwIP DHCP code when receiving a DHCP OFFER with more than 2 DNS servers.


  1. Fix the bug in LwIP code: particle-iot/lwip#4
  2. Disables LwIP assertions in non-debug builds

Steps to Test

Configure DHCP server to provide more than 2 DNS servers. The devices should successfully lease an IP address without going into panic.

Example App




  • User is totes amazing for contributing!
  • Contributor has signed CLA (Info here)
  • Problem and Solution clearly stated
  • Run unit/integration/application tests on device
  • Added documentation
  • Added to after merging (add links to docs and issues)

@avtolstoy avtolstoy added bug mesh labels Dec 3, 2018

@avtolstoy avtolstoy requested a review from sergeuz Dec 3, 2018


sergeuz approved these changes Dec 3, 2018

@avtolstoy avtolstoy merged commit 771471a into mesh-develop Dec 3, 2018

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@avtolstoy avtolstoy deleted the fix/lwip-dhcp-max-servers branch Dec 3, 2018

avtolstoy added a commit that referenced this pull request Dec 6, 2018

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