Re: Share internet connection/make a small server

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--- Alexander Dalloz <ad+lists@xxxxxxxxx> wrote:

> Am Di, den 30.08.2005 schrieb Antonio Olivares um
> 15:02:
> 
> > > Make sure you have forwarding set on on the
> gateway
> > > host:
> > > 
> > > $ cat /proc/sys/net/ipv4/ip_forward
> > > 
> > > must print out "1" (without quotes). If it does
> not,
> > > then activate it in
> > > /etc/sysctl.conf and run "sysctl -p". Make too
> sure
> > > the gateway does NAT
> > > by an iptables rule like:
> > > 
> > > iptables -A POSTROUTING -o eth0 -j MASQUERADE
> > > 
> > > [eth0 should be in your case the outgoing
> device]
> > 
> > eth0 is the incoming connection should eth1 be the
> > outgoing.  I'm a little confused but getting
> there.
> 
> The device given with -o <device> has to be the
> public net device.
>  
> > [root@rio ~]# cat /proc/sys/net/ipv4/ip_forward
> > 1
> 
> Ok.
> 
> > [root@rio ~]# iptables -A POSTROUTING -o eth0 -j
> > MASQUERADE
> > iptables: No chain/target/match by that name
> 
> Sorry, my fault. Above should have been for the NAT
> table (by default
> iptables takes the filter table):
> 


# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
The device that comes in is eth0 and the one that is
acting as the output is eth1 should the above command
be changed to eth1?  

> 
> > I have made most changes that Jeff and Alexander
> have
> > provided and I know that I am close as possible to
> > getting this thing going.  
> > I tried to connect to the internet from within
> Windows
> > 98 machine and I get a DNS error and cannot
> connect. 
> 
> The NATed client has to know a valid DNS server and
> it's gateway is the
> NAT gateway host.
> 
> > However, the ipconfig /all, ipconfig /release_all
> and
> > ipconfig /renew_all give the following
> 
> > Windows 98 IP Configuration
> 
> > 1 Ethernet adapter :
> 
> >  Description . . . . . . . . : 3Com 3C90x Ethernet
> > Adapter
> > 
> >  Physical Address. . . . . . : 00-C0-4F-73-25-42
> > 
> >  DHCP Enabled. . . . . . . . : Yes
> > 
> >  IP Address. . . . . . . . . : 192.168.100.200
> > 
> >  Subnet Mask . . . . . . . . : 255.255.255.0
> > 
> >  Default Gateway . . . . . . : 192.168.100.1
> > 
> >  DHCP Server . . . . . . . . : 192.168.100.1
> > 
> >  Primary WINS Server . . . . : 
> > 
> >  Secondary WINS Server . . . : 
> > 
> >  Lease Obtained. . . . . . . : 08 30 05 7:22:21 AM
> > 
> >  Lease Expires . . . . . . . : 08 31 05 7:22:21 AM
> 
> So eth1 on the Fedora machine is your inner (LAN)
> network device and
> eth0 for NAT.
> 
> > It is probably something with the settings. 
> > Apparently everything looks ok but connection not
> > good.  Thanks for all suggestions and help
> provided.  
> 
> Is the LAN client able to ping IP 10.154.19.136? Is
> it able to ping IP 
> 64.233.183.99?
> 
> > Antonio
> 
> Alexander
> 
> 
> -- 
> Alexander Dalloz | Enger, Germany | GPG
> http://pgp.mit.edu 0xB366A773
> legal statement: http://www.uni-x.org/legal.html
> Fedora Core 2 GNU/Linux on Athlon with kernel
> 2.6.11-1.35_FC2smp 
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> 0.08, 0.07, 0.08 
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The configuration is not working in Windows98.  I do
not know how to mess with the settings.  I should try
tomorrow with a livecd like DSL/feather linux because
the machine has only 32MB of ram.  

[root@rio ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags
Metric Ref    Use Iface
192.168.100.0   0.0.0.0         255.255.255.0   U    
0      0        0 eth1
10.154.19.0     0.0.0.0         255.255.255.0   U    
0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U    
0      0        0 eth0
0.0.0.0         10.154.19.1     0.0.0.0         UG   
0      0        0 eth0
[root@rio ~]# ifconfig -a
eth0      Link encap:Ethernet  HWaddr
00:50:2C:A6:19:28
          inet addr:10.154.19.136  Bcast:10.154.19.255
 Mask:255.255.255.0
          inet6 addr: fe80::250:2cff:fea6:1928/64
Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500 
Metric:1
          RX packets:3709 errors:0 dropped:0
overruns:0 frame:0
          TX packets:1160 errors:0 dropped:0
overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1076413 (1.0 MiB)  TX bytes:179791
(175.5 KiB)
          Interrupt:11 Base address:0xae00

eth1      Link encap:Ethernet  HWaddr
00:60:97:C5:2A:C3
          inet addr:192.168.100.1 
Bcast:192.168.100.255  Mask:255.255.255.0
          inet6 addr: fe80::260:97ff:fec5:2ac3/64
Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500 
Metric:1
          RX packets:171 errors:0 dropped:0 overruns:0
frame:0
          TX packets:98 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:17772 (17.3 KiB)  TX bytes:11736
(11.4 KiB)
          Interrupt:11 Base address:0xec00

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:95 errors:0 dropped:0 overruns:0
frame:0
          TX packets:95 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:0
          RX bytes:6570 (6.4 KiB)  TX bytes:6570 (6.4
KiB)

sit0      Link encap:IPv6-in-IPv4
          NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0
frame:0
          TX packets:0 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

[root@rio ~]#  

Thanks for all helpful advice and suggestions.  I will
report back as I continue with this problem.

Kind Regards,

Antonio

P.S.  I have installed webmin but I get an error
message 

The connection to rio.10000 has terminated
unexpectedly .  Some data may be tranferred.  


		
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