> I am setting up a home network and for now I want to connect to the
> Internet via diald .99.1 on RH6.1. When I bring up my browser and try to
> access a site on the Internet, I get error messages that say, "Netscape
> is unable to locat the server www.redhat.com. Please check the server
> name and try again." This comes up immediately before it even tries to
> dial the modem. I have a hunch that what I need is a DNS entry that
> tells my machine to look for this somewhere else, but I'm not sure how
> to tell Linux what my ISP's DNS servers are so that the URL could be
> resolved to an IP, but that's as smart as I get. Any help would be
> GREATLY appreciated.
> Thanks,
> Jim
I'm not an expert on route but in looking at your routing table it looks like
you have two default routes. From what I can see you have a default route
that goes through the gateway system at 192.169.1.254 that precedes the default
route for the sl0 interface. If your using some network configuration tool you'll
want to remove the default gateway since that is added dynamically to your route
table when the PPP connection is brought up. In order for diald to actually
bring up the link you need to have packets routed to the sl0 interface. This is the
interface diald watches for outgoing packet activity. Since all packets are
getting routed to the 192.168.1.254 gateway system rather then the sl0 interface
diald is probably not even going to attempt to dial the modem.
If you're going to use your Linux box as a gateway system for your home
network make sure that IP forwarding is enabled and that the first outgoing
packet is held until the IP address is assigned through PPP.
Here's a simple script fragment that sets this up.
echo "1" > /proc/sys/net/ipv4/ip_forward
# Make system hold the first outgoing packet until our
# dynamic IP address has been assigned.
echo 1 > /proc/sys/net/ipv4/ip_dynaddr
For setting up DNS, this is configured in the /etc/resolv.conf file. I would setup
the Linux box and all of the internal systems on my network to use our ISP's
nameservers. The format of the file is like so:
search your.domain.com
nameserver xxx.xxx.xxx.xxx
nameserver xxx.xxx.xxx.xxx
Replace <your.domain.com> with your ISP's domain and enter the IP addresses
for your ISP's primary and secondary name servers in xxx entries. Also
setup any systems inside your network that are going to go through your Linux
gateway system to use your ISP's nameservers as well. If you're sharing a
single IP address with multiple systems inside your network you'll want to
setup IP masquarading to keep your home network private.
Here's a link that discusses home network security and offers some sample
firewall scripts:
http://linuxgazette.com/issue46/pollman.html
Since Linux can act as a server I suggest setting up a
firewall to keep would be script kiddies out of your system. I've seen
numerous port scans hit my Linux gateway system even with a transient PPP
connection. This is even more of a concern if you go with DSL or a cable
modem since those types of connections are always on. I see many posts
from people in this newsgroup where they just plug their DSL or cable modem
into their network hub which leaves there entire home network open for
possible hacking.
Good Luck,
Tony
Quote:> In case it helps, I have the following files:
> /etc/diald.conf:
> include /usr/lib/diald/standard/filter
> mode ppp
> device /dev/modem
> pppd-options asyncmap 0
> speed 57600
> crtscts
> defaultroute
> loc
> modem
> dynamic
> local 127.0.0.2
> remote 127.0.0.3
> connect "/usr/sbin/chat -f /etc/sysconfig/network-scripts/chat-ppp0
> fifo /etc/diald/diald.ctl
> /etc/sysconfig/network-scripts/chat-ppp0:
> ABORT 'BUSY'
> ABORT 'NO CARRIER'
> "" AT
> OK ATDT(phonenumber)
> CONNECT \c
> user: (username)
> word: (password)
> The results of the lsmod command is:
> Module Size Used by
> slip 7700 2 (autoclean)
> slhc 4328 1 (autoclean) [slip]
> tulip 25252 1 (autoclean)
> The results of the route command is:
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
> Iface
> 192.168.1.254 * 255.255.255.255 UH 0 0 0
> ethO
> 127.0.0.3 * 255.255.255.255 UH 0 0 0
> sl0
> 192.168.1.0 * 255.255.255.0 U 0 0 0
> eth0
> 127.0.0.0 * 255.0.0.0 U 0 0 0 lo
> default 192.168.1.254 0.0.0.0 UG 0 0 0
> eth0
> default * 0.0.0.0 U 1 0 0
> sl0
--
Anthony Schlemmer
by