looking at manual page for rc.conf

Charles Swiger cswiger at mac.com
Mon May 18 20:51:40 UTC 2015

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?


> 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 netmask"
> When the router is at, how would this be specified.

Add: defaultrouter=""  ...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.


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