home networking in fedora

akhil_raj27 · 09-29-2005, 09:32 AM

hi

I want to connect two systems working on linux OS only to internet. distribution using is fedora 3. can any 1 help me in this regard. i'm using a dial up connection.

thank u.

Snowbat · 09-29-2005, 01:16 PM

Do you have dialup working on system A, and system B connected to system A by ethernet?

akhil_raj27 · 09-30-2005, 10:12 AM

thanks for the reply,

Actually what i have done is i had already assigned
IP address of PC A as 192.168.10.1 and that of PC B as 192.168.10.2.
If i give 'ping 192.168.10.2' from A, it responds correctly.
I have internet connected to PC A, but not to PC B.
I want to access internet in PC B through PC A.
Help me please.

Snowbat · 09-30-2005, 11:11 AM

Assuming your internet connection is ppp0, run the following commands on PC A:

Code:

/sbin/modprobe iptable_nat
/sbin/iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward

For name resolution you'll need to copy your ISP nameserver details from /etc/resolv.conf on PC A to /etc/resolv.conf on PC B. You should also run /sbin/route on PC B and check that your default route is set to 192.168.10.1. If not, run this:

Code:

/sbin/route add default gw 192.168.10.1

akhil_raj27 · 10-01-2005, 07:33 AM

Thanks for the reply.

All commands went on nicely.
Even then i couldn't been able to connect to the internet from B through A.
This is the result of

Code:

cat /sbin/route

in PC B.

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0

Result of

Code:

ifconfig

in PC A is given below.

eth0 Link encap:Ethernet HWaddr 00:20:ED:0F:06:12
inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:440 errors:0 dropped:0 overruns:0 frame:0
TX packets:450 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:38957 (38.0 KiB) TX bytes:50089 (48.9 KiB)
Interrupt:11 Base address:0xc000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:4002 errors:0 dropped:0 overruns:0 frame:0
TX packets:4002 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3399163 (3.2 MiB) TX bytes:3399163 (3.2 MiB)

ppp0 Link encap:Point-to-Point Protocol
inet addr:219.64.186.118 P-t-P:172.23.128.82 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1400 Metric:1
RX packets:1776 errors:2 dropped:0 overruns:0 frame:0
TX packets:2158 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:903632 (882.4 KiB) TX bytes:259117 (253.0 KiB)

Help me please..................

Snowbat · 10-01-2005, 09:05 PM

I see you've moved PC A eth0 to 192.168.0.1. Have you also moved PC B eth0 to 192.168.0.2? If PC B is still at 192.168.10.2, it's not gonna work (well it could if you change netmasks on both but let's not go there

)

akhil_raj27 · 10-02-2005, 01:07 AM

Thanks.
yes, i have changed PC B ip address to 192.168.0.2.
and PC A address is 192.168.0.1.
What to do?.

Snowbat · 10-02-2005, 06:18 AM

When the dialup connection is established on PC A, run the following on PC B and tell me what you see:

Code:

 /usr/sbin/traceroute 68.142.197.85

(Your traceroute program may be located in a different directory or not installed yet. - if you get bash: /usr/sbin/traceroute: command not found modify path or install it)

akhil_raj27 · 10-03-2005, 01:30 AM

This is the result

Code:

[root@nayan ~]# /usr/sbin/traceroute 68.142.197.85
traceroute to 68.142.197.85 (68.142.197.85), 30 hops max, 38 byte packets
 1  192.168.0.2 (192.168.0.2)  2594.128 ms !H  3000.358 ms !H  3000.380 ms !H

Snowbat · 10-03-2005, 05:23 PM

!H means an ICMP message was received (presumably from PC A) indicating "Host Unreachable. The router has no route to the target system."

Did you remember run these commands on PC A after establishing the dialup connection?

Code:

/sbin/modprobe iptable_nat
/sbin/iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward

nayankk · 10-04-2005, 07:45 AM

yes i have done that

Snowbat · 10-04-2005, 10:39 AM

Are there any firewall rules on PC A or PC B that would block this NAT connection?