network config files

threadhead · 12-01-2002, 04:37 AM

hi you.

im using slackware 8.1 for my gateway at home.
before that i was using redhat and used the files in /etc/sysconfig/ to configure options like ipforward and ipfragmentation.

but i cannot find these files on my slackware host. thats because of BSD style slackware uses.
i hope anyone of you knows where to find these configuration files for slackware.

any help would be appreciated. thanks

peter_robb · 12-01-2002, 02:25 PM

They mostly live in the virtual directory /proc/sys/net/ipv4/~

If you want to make any settings permanent, add them to /etc/sysctl.conf

eg
echo 1 > /proc/sys/net/ipv4/ip_forward
turns ip_forwarding on for ALL interfaces

proc.sys.net.ipv4.ip_forward = 1
is done in the /etc/sysctl.conf file

Most of these are done via startup scripts for interfaces, firewalls etc...
http://iptables-tutorial.frozentux.n.../ip-sysctl.txt is a brief explanation of them.

threadhead · 12-01-2002, 03:02 PM

i dont think there exists a file called /etc/sysctl.conf either on my system.

is it enough to create this file and put it somewhere in the bootscript?

thank you

moses · 12-01-2002, 03:10 PM

/etc/rc.d

Ciccio · 12-01-2002, 04:27 PM

/etc/rc.d/rc.local is where I put that kind of lines (echo # /proc/sys/net/ipv4/whateve_to_modify)

threadhead · 12-02-2002, 08:02 AM

i will try this out...maybe this fixes my problems

neo77777 · 12-02-2002, 08:32 AM

actually ip forwarding is turned on by default on every slackware installation unless you refused to install start up scripts, more details are in /etc/rc.d/rc.inet* (there are two files rc.inet1 and rc.inet2 and I am a bit short on memory which one has the magic echo statement), so everything else can go there as well.

Ciccio · 12-02-2002, 11:32 AM

Sorry, I use Mandrake and Red H@

jamesmwlv · 12-02-2002, 12:07 PM

I have a working system that does IP Masquerading and it has been running fine for a while (RH7.2), the problem is, I cannot remember where i put the "Magic IP to turn up ip forwarding. What I want to know, is their a "find" method to search the contents of files for a paticular sring of text?

Thanks,
james Wadkins
james@vtat.com

threadhead · 12-02-2002, 01:36 PM

yes of course there is.

you have to use the command grep.

i guess its syntax due to this use is:

Code:

grep / <stringoftext>

this searches every folder for the specified text.
if this doesnt work, go for

Code:

man grep
or
grep --help

jamesmwlv · 12-02-2002, 03:36 PM

Tried your advise and no luck. Looked at the hrlp file for grep and tried a few other things will not luck.
Thanks,
James Wadkins
james@vtat.com

Ciccio · 12-02-2002, 06:19 PM

Ok, then try using the FSH standard... Check /etc /proc/sys/net/ipv4/~ /home/~ /root

threadhead · 12-05-2002, 09:12 AM

finally i installed slackware 8.1 again to ensure that there was no error during the installtion.

as usual i can ping my external interface IP when online.
i added the nameservers in the /etc/resolv.conf file and wrote iptables rules for my external interface(eth1).

Code:

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A INPUT -i eth0 -m state --state NEW,INVALID -j DROP
iptables -A FORWARD -i eth0 -m state --state NEW,INVALID -j DROP
echo 1 > /proc/sys/net/ipv4/ip_forward

when i try to use lynx with my client ie like
lynx linuxquestions.org
a message like:looking up url first
but when i try to lynx an IPaddress
a message like:making http connection to site
but nothing happens.

where is my problem?
is it maybe the client, or are the firewall rules not written correct?

please help me

Ciccio · 12-05-2002, 06:18 PM

Try with Konqueror or Mozila

moses · 12-05-2002, 10:26 PM

Quote:

Originally posted by jamesmwlv
I have a working system that does IP Masquerading and it has been running fine for a while (RH7.2), the problem is, I cannot remember where i put the "Magic IP to turn up ip forwarding. What I want to know, is their a "find" method to search the contents of files for a paticular sring of text?

I think what you need is in /etc/init.d, but I'm not sure about the RH
setup. It'll be somewhere under the /etc directory.

Code:

cd /etc/
grep -r "string you want to find" *

This searches every file under /etc for "string you want to find"

A portion of my firewall code:

Code:

echo "   clearing any existing rules and setting default policy.."
$IPTABLES -P INPUT ACCEPT
$IPTABLES -F INPUT 
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -F OUTPUT 
$IPTABLES -P FORWARD DROP
$IPTABLES -F FORWARD 
$IPTABLES -t nat -F

echo "   FWD: Allow all connections OUT and only existing and related ones IN"
$IPTABLES -A FORWARD -i $EXTIF -o $INTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT
$IPTABLES -A FORWARD -j LOG

echo "   Enabling SNAT (MASQUERADE) functionality on $EXTIF"
$IPTABLES -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE