[Nfd-dev] [EXT] IncomingFaceIdTag is null

[Shi, Junxiao - (shijunxiao)]

Hi Guangyu

ndn6-facemon has IncomingFaceId usage:
https://github.com/yoursunny/ndn6-tools/blob/af7d60160bad1608040ca75b54c24c48e4519f4a/facemon.md
https://github.com/yoursunny/ndn6-tools/blob/af7d60160bad1608040ca75b54c24c48e4519f4a/facemon.cpp

You can try this program to see whether your NFD build supports IncomingFaceId.
You can compare your code to this program to see whether any step is missing.

Yours, Junxiao
________________________________
From: Nfd-dev <nfd-dev-bounces at lists.cs.ucla.edu> on behalf of 郝广宇 <haoguangyu at chorustek.com>
Sent: Wednesday, May 20, 2026 1:18 PM
To: nfd-dev <nfd-dev at lists.cs.ucla.edu>
Subject: [EXT] [Nfd-dev] IncomingFaceIdTag is null


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Dear team,
Below, egw and igw implement intranet/extranet access penetration by creating a TCP link between  egw and igw NFD. Now we encounter a problem: igw always gets faceid as 0 when calling `interest.getTag<ndn::lp::IncomingFaceIdTag>`. Therefore, we cannot obtain the faceid of the TCP link between egw and igw from the interest packet. We want to know why `ndn::lp::IncomingFaceIdTag` is not working. We have confirmed that the interest packet is received via the TCP link. Could it be that support for `IncomingFaceIdTag` is disabled in the compilation of NFD or ndn-cxx, or is there another reason? We need this feature to work. Thank you very much!

BR.
GuangYu
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