hi friends,
My friend and myself are trying to configure a LAN and
internet Connection:
We have 2 machines, one Mandrake 9.1 and other Red Hat
9. The Mandrake Machine is connected to internet via a
DSL Modem. The Red Hat 9 Laptop is connected to it via
a Ethernet Hub.
If I write ifconfig on the Mandrake Shell I get
-------------------------------------------------------
eth0 Link encap:Ethernet HWaddr
00:50:FC:09:38:34
inet addr:10.0.0.10 Bcast:10.0.0.255
Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500
Metric:1
RX packets:3744 errors:0 dropped:0
overruns:0 frame:0
TX packets:3946 errors:0 dropped:0
overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:1621014 (1.5 Mb) TX bytes:522670
(510.4 Kb)
Interrupt:10
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:409 errors:0 dropped:0 overruns:0
frame:0
TX packets:409 errors:0 dropped:0 overruns:0
carrier:0
collisions:0 txqueuelen:0
RX bytes:27068 (26.4 Kb) TX bytes:27068
(26.4 Kb)
ppp0 Link encap:Point-to-Point Protocol
inet addr:80.116.12.216 P-t-P:192.168.100.1
Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST
MTU:1492 Metric:1
RX packets:3309 errors:0 dropped:0
overruns:0 frame:0
TX packets:3485 errors:0 dropped:0
overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:1517214 (1.4 Mb) TX bytes:415013
(405.2 Kb)
------------------------------------------------------
In /etc/sysconfig/network-scripts I have the file
ifcfg-eth0 which is
DEVICE=eth0
BOOTPROTO=static
IPADDR=10.0.0.10
NETMASK=255.255.255.0
NETWORK=10.0.0.0
BROADCAST=10.0.0.255
ONBOOT=yes
-------------------------------------------------------
I hope eth0 interface is for the LAN and the ppp is
for connection to internet via the DSL Modem.
The ifcfg-eth0:1 file in the
/etc/sysconfig/network-scripts of the Red Hat 9 is
DEVICE=eth0:1
BOOTPROTO=none
ONBOOT=yes
USERTL=no
PEERDNS=yes
IPADDR=10.0.0.11
NETMASK=255.255.255.0
GATEWAY=10.0.0.10
NETWORK=10.0.0.0
BROADCAST=10.0.0.255
I am running the following firewall script in the
Mandrake 9.1, which runs without any errors
------------------------------------------------------
IPTABLES=/sbin/iptables
INSMODE=/sbin/modprobe
EXTIF="ppp+"
ANY=0.0.0.0/0
INTIF="eth0"
echo "external interface: $EXTIF"
echo "internal interface: $INTIF"
echo -en "ip_tables, "
modprobe ip_tables
echo -en "ip_conntrack, "
modprobe ip_conntrack
echo -en "ip_conntrack_ftp, "
modprobe ip_conntrack_ftp
echo -en "ip_conntrack_irc, "
modprobe ip_conntrack_irc
echo -en "ip_conntrack_irc, "
modprobe ip_conntrack_irc
echo -en "iptable_nat, "
modprobe iptable_nat
echo -en "ip_nat_ftp, "
modprobe ip_nat_ftp
echo -en "ip_nat_irc, "
modprobe ip_nat_irc
echo -en "Enabling forwarding"
echo "1" > /proc/sys/net/ipv4/ip_dynaddr
echo "clearing any existing rules and settings 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
$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
$IPTABLES -t nat -A POSTROUTING -o $EXTIF -j
MASQUERADE
------------------------------------------------------
In /etc/resolv.conf file of the Mandrake I have
search Telecom
nameserver 217.141.105.205
nameserver 212.216.112.112
-------------------------------------------------------
When I ping from 10.0.0.10(Mandrake Machine) to
10.0.0.11 (Red Hat 9 Laptop) and vice versa it works
well on both the machines.
For ex: ping from 10.0.0.10 to 10.0.0.11, result is
similar vice versa.
[root@xxxxxxxxx ppp]# ping 10.0.0.11
PING 10.0.0.11 (10.0.0.11) 56(84) bytes of data.
64 bytes from 10.0.0.11: icmp_seq=1 ttl=64 time=0.695
ms
64 bytes from 10.0.0.11: icmp_seq=2 ttl=64 time=0.493
ms
64 bytes from 10.0.0.11: icmp_seq=3 ttl=64 time=0.488
ms
--- 10.0.0.11 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss,
time 1998ms
rtt min/avg/max/mdev = 0.488/0.558/0.695/0.100 ms
--------------------------------------------------------
After running the firewall script
[root@xxxxxxxxx ppp]# service network restart
Disactivating the interface eth0: [ OK ]
Disactivating interface of loopback: [ OK ]
Configuring the net parameters: [ OK ]
Activating interface of loopback: [ OK ]
Activating the interface eth0: [ OK ]
----------------------------------------------------
Internet is working very fine on the Mandrake Machine
10.0.0.10 but I am not able to access Internet from
the Red hat 9 Laptop 10.0.0.11. Also, I dont see IP
forwarding included in the above OK Messages although
I have included that in the firewall script
I fail to understand where is the problem.
Please help,
Thanks a Lot,
Sincerely
Rebel
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