setting up a secondary ip stack (/net.alt) in 9front
====================================================

this example is for a machine with multiple ethernet devices
('#l0', '#l1', ...)

we assume that the system is a cpu server and that the first
ethernet device '#l0' (connected e.g. to a lan) is already
bound to the primary ip stack /net

in these instructions we bind the second device '#l1' (e.g. an
external connection) to a secondary ip stack /net.alt which
will be independent from the primary /net stack

steps:

- copy /lib/ndb/local to /lib/ndb/external

- edit /lib/ndb/external to suit the new stack

- mkdir -p /sys/$sysname/service.alt (for listen(8))

- add to /cfg/$sysname/cpustart (executed by /rc/bin/cpurc):

bind -b '#l1' /net.alt
bind -b '#I1' /net.alt
ip/ipconfig -x /net.alt ether /net.alt/ether1
ndb/cs -x /net.alt -f /lib/ndb/external
ndb/dns -r -x /net.alt -f /lib/ndb/external
aux/listen -q -t /rc/bin/service.auth -d /cfg/$sysname/service.alt /net.alt/tcp

- adjust the ip/ipconfig and aux/listen lines above to suit
  the new stack if needed

- add to /cfg/$sysname/namespace (executed by /lib/namespace):

bind -a #l1 /net.alt
bind -a #I1 /net.alt
mount -a /srv/cs_net.alt /net.alt
mount -a /srv/dns_net.alt /net.alt

- reboot (fshalt -r)

helpful commands:

	netstat /net.alt
	snoopy /net.alt/ether1

see also: ipconfig(8)