There's a copy of ultrix-11, which is v7 based with some 4.1BSD additions, including sockets and a TCP/IP stack. Don't know if it runs on the smaller PDP-11, but it looks like it might. The sources are in the TUHS archives. Seems like the best low-end v7ish kernel with TCP/IP around, but I've not used it extensively.

Warner

On Fri, May 19, 2017 at 1:04 PM, Ron Natalie <ron@ronnatalie.com> wrote:

To my knowledge no. We had already gone to code overlays on the 11/34’s just to get the pre-TCP unix working. When we needed yet another segment to map mbufs (which we could do on the 11/70), there just weren’t any left. It was then that I scarfed up all the 11/23, 24, 34’s that were available and turned them into routers.