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[lwip-devel] [bug #60607] IP traffic "leaks" between netifs

From: Indan Zupancic
Subject: [lwip-devel] [bug #60607] IP traffic "leaks" between netifs
Date: Mon, 17 May 2021 04:21:20 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36

Follow-up Comment #2, bug #60607 (project lwip):

This is standard IP stack behaviour. Keep in mind the same happens for all
outgoing packets.

The below code is "fixed" by adding an #if or #ifdef just after netif =

At my work we use multiple interfaces for (physical) network redundancy and we
need hard separation between networks, both for incoming as well as outgoing
packets (in case peers are behind routers in different subnets and standard
routing may choose the wrong interface). We changed both incoming as outgoing
code paths to guarantee strict network separation.

If there is enough interest I can ask permission to release the full patchset
for merging with upstream lwIP.


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