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On Oct 12, 2020, 2:10 PM, at 2:10 PM, Rocky Hotas <rockyho...@firemail.cc> wrote: >Hello! >Thanks to your suggestions for a NIC (in particular, thanks to Martin: >Realtek worked), I configured a second NIC in a NetBSD 9.0 (release) >machine. >I would like to use it as a 1) gateway and 2) DHCP server, but didn't >find much documentation as regards problem 1). > >Assume that the machine's hostname is netbsd_gateway and its two NICS >are NIC1 and NIC2. > >My intention is to create two subnets: subnet1 for all the LAN hosts, >included NIC1, and subnet2 just for NIC2 and the modem. This second >subnet should never be directly accessible from the LAN hosts. > >In this moment, netbsd_gateway should simply forward the packets >(sent from LAN hosts to the external internet) to the modem and the >packets from the modem (coming from internet) to the proper LAN >destination host. > >(As a further step, I would like to use a traffic shaping tool, to >tweak >the available bandwidth and priority for single hosts, but this is a >separate problem). > >IIUC, some preliminary operations are: > >- put `net.inet.ip.forwarding=1' in /etc/sysctl.conf; >- put `gateway_enable="YES"' in /etc/rc.conf. > >But then I don't know how to proceed. Which is the correct approach? >Should I use npf? I found that /usr/share/examples/npf/l2tp_gw-npf.conf >depicts something similar to what I'm trying to do, but it includes >several filterings and protocols. >Should I build a bridge? And how to configure the routing tables? > >I'm aware that these are many questions. >Of course, if anyone knows about a tutorial or guide, it's hugely >welcome! > >Thank you in any case, > >Rocky
