Fedora Networking :: Configuring NAT On Desktop Computer
May 17, 2011
Yesterday i've installed Fedora 14 x64 on my desktop PC. Everything is working just fine, but then i came to the problem of sharing internet connection for other computers (strictly speaking, two laptop ones) that i use at home.
I know, there were many articles that cover that problem, but nevertheless i was unable to make the things work.
So, going to the point (i would point it out for clarify):
1) My desktop computer has two Ethernet interfaces (eth0 and eth1) and single WiFi one (wlan0), that is not used at the moment.
2) Desktop's eth0 is connected directly to the internet via cable; interface is configured to work in DHCP mode and it is working properly.
3) Desktop's eth1 is connected to the router (WRT54GL, as far as i can remember model) and it was used (under Windows XP) to provide shared internet connection; it is configured to have static IP of 192.168.0.1 with mask of 255.255.255.0 (default settings for XP I-net Connection Sharing) and i've configured it in such way in Fedora.
3) Router (connected to the eth1 in desktop) acts also as DHCP server, that assigns IP addresses for all (but already static-assigned desktop) connected computers (no mater, cable or WiFi). Newly connected computer receives IP of 192.168.0.x, where x lies within range 3..63 (1 and 2 are reserved for desktop and laptop itself, respectively), mask of 255.255.255.0 and gate / DNS of 192.168.0.1
4) Both laptops have enabled DHCP (one uses XP, while the other uses Fedora 14 32bit)
When i connect laptop, it receives IP / mask properly from router's DHCP, but i have no idea how to configure desktop to route I-net packets from eth1 to eth0. First thing i've made was to enable IP forwarding, by adding line.
Code:
Code:
For the moment i have two questions:
1) How to check whether internet packets are routed properly ?
2) How to enable (or "route") DNS ? Is there a need to configure DNS on desktop ? Or somewhat DNS packets can be "routed", since during eth0 autoconfiguration it already receives DNS addresses from i-net provider ?
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Apr 20, 2011
I have 2 pc's at home, neither v flashy but both more than capable of running this. Previously I had them both running XP SP2. One pc has 2 NICs in it and the second only one. So, PC1 (now running Ubuntu desktop 10.04) has the 2 NICs installed ...
1) A realtek NIC which is on 'eth1' and from which I receive internet connectivity from the router of this shared house. (2 other people connect their PCs to the internet via this router.)
2) A 3com NIC on 'eth0' which I have connected (using a crossover cable) to the Intel 'PRO100 VM' NIC on PC2.
Admittedly this took me some time to get half working. Currently I can connect to the internet through 'eth1' OR to PC2 via 'eth0' BUT NOT AT THE SAME TIME. However, If I disconnect one (by left clicking on 'disconnect' under the top of screen menu bar, then the other one will immediately work ... and visa versa.
I had this working when both PC's were running windows XP but now in trying to educate myself further I have installed Ubuntu on PC1 and am attempting the same thing. I refuse to accept that as alot of these thread responses state, that it 'can't be done'. Quite clearly it can be done since the physical connections and hardware are no different, its just about ensuring that the protocols are all correct and that I haven't done something stupid.
I am very keen to learn more about computer networks and equally keen to educate myself in the ways of Linux, in fact I am studying to gain a network qualification as we speak but at this stage its still a little confusing. I have learned an awful lot about the fundamentals of networking but the 'hands on stuff' is where I really need to test myself.
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Is there a way (besides buying a wi-fi adapter) to get Internet access on my desktop computer through networking so that the router would give both computers Internet access at the same? My Gentoo desktop does have an ethernet adapter that perhaps I could useThe router has several LAN ports and one WAN port, both unused.
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Quote: em1 Link encap:Ethernet HWaddr F4:6D:04:34:92:2B inet addr:192.168.0.184 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::f66d:4ff:fe34:922b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:744250 errors:0 dropped:0 overruns:0 frame:0 TX packets:548987 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:841392242 (802.4 MiB) TX ytes:60384500 (57.5 MiB) Interrupt:18 Memory:f7100000-f7120000
he-ipv6 Link encap:IPv6-in-IPv4 inet6 addr: 2001:470:1c:611::3/64 Scope:Global inet6 addr: fe80::cea7:b778/128 Scope:Link UP POINTOPOINT RUNNING NOARP MTU:1480 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:61 dropped:0 overruns:0 carrier:61 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
[Code]....
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