I have 2 pppoe connections pppoe0 and pppoe1.

pppoe0 is my default gateway and people can access my http server via
its IP address.

But it is not working for pppoe1's IP address.

I tried the following pf rule for pppoe1:

pass in log on pppoe1 \
        inet proto {tcp udp} \
        reply-to (pppoe1 pppoe1)

I can see the traffic coming in from the internet but it never replies.

So I am suspecting that the http server got the http request but
couldn't do a http response?

UDP traffics seem to work fine.

Running 4.6-current.

Thanks.