Xfinity most probably has caps. Also, not symmetric.
https://www.tomshardware.com/how-to/turn-old-router-into-extender
https://www.reddit.com/r/HomeNetworking/comments/14zu357/comment/js0e8dz/?utm_source=share&utm_medium=web2x&context=3
Xfinity most probably has caps. Also, not symmetric.