looking at manual page for rc.conf

[Charles Swiger]

On May 18, 2015, at 1:37 PM, Jeffry Killen <jekillen at prodigy.net> wrote:
> I am looking at the manual page for rc.conf and am wondering
> how I would specify default router address when using DHCP?

Normally one doesn't need to do so; DHCP is supposed to configure that for you.

> I don't see any further explicit elucidations beyond the text quoted below.
> 
> text from man page:
> 
> It is possible	to bring up an interface with DHCP by adding ``DHCP'' to the ifconfig_<interface> variable.
> For instance, to initialize the ed0 device via DHCP,	it is possible to use something like:
> ifconfig_ed0="DHCP"
> 
> actually, I have
> ifconfig_em0="DHCP"
> Is the router address something that DHCP will figure out?

Yes.

> This interface will be for connection to internet via DSL modem
> ISP is CenturyLink.
> 
> or alternately, suppose I want to assign a static address to interface
> that would connect to internet via DSL modem.
> ifconfig_em0="inet 192.168.0.4 netmask 255.255.255.0"
> When the router is at 192.168.0.1, how would this be specified.

Add: defaultrouter="192.168.0.1"  ...to /etc/rc.conf.

> I have also looked at ifconfig(8) and have found anything.

ifconfig(8) sets up an interface; route(8) manages routing.

> I have also had the kernel complain via a shell script set to
> run in
> 
> I am also concerned about setting up tcp wrappers with inetd
> to forestal possible attempts to access via telnet, ssh, ftp and
> even MySql server (as I have seen frequently when I had static
> ip address service).

tcp wrappers typically only affects services launched by inetd, which
doesn't normally include SSH or MySQLd.

> This I have done when I did have static ip
> service. But with fire wall in DSL modem and DHCP configuration
> is it useful and advantageous?

Yes, even a local per-host firewall improves security by a useful amount.

Regards,
-- 
-Chuck