----- Original Message -----
From: "Vladimir G. Ivanovic" vladimir@xxxxxxx
> I can't get my laptops to connect to the outside world, although they
> reach their DHCP server just fine.
>
> Two laptops, the DHCP server, some other machines and a DSL modem are
all
> connected to a 10/100 Mb Ethernet hub with the following IP addresses:
>
> network: 64.166.134.112
> netmask: 255.255.255.248
> DHCPserver: 64.166.134.117 (RH9)
> DSLmodem: 64.166.134.118
>
> network: 192.168.10.0
> netmask: 255.255.255.0
> laptop1: 192.168.10.109 (RH9)
> laptop2: 192.168.10.127 (WinXP)
>
> I set up the DHCP server's routing table with three commands in
/etc/rc.local:
>
> ifconfig eth0:1 192.168.10.1
> route add -host 192.168.10.1 eth0:1
> route add -net 192.168.10.0 netmask 255.255.255.0 eth0:1
>
> which gives this routing table:
>
> Destination Gateway Genmask Flags Metric Ref
Use Iface
> 64.166.134.117 0.0.0.0 255.255.255.255 UH 0 0
0 eth0
> 192.168.10.1 0.0.0.0 255.255.255.255 UH 0 0
0 eth0
> 64.166.134.112 0.0.0.0 255.255.255.248 U 0 0
0 eth0
> 192.168.10.0 64.166.134.117 255.255.255.0 UG 0 0
0 eth0
> 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0
0 eth0
> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0
0 lo
> 0.0.0.0 64.166.134.118 0.0.0.0 UG 0 0
0 eth0
>
> The DHCP server's Ethernet network interface:
>
> eth0 Link encap:Ethernet HWaddr 00:E0:18:05:A9:68
> inet addr:64.166.134.117 Bcast:64.166.134.119
Mask:255.255.255.248
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:440089 errors:0 dropped:0 overruns:0 frame:0
> TX packets:409012 errors:0 dropped:0 overruns:1 carrier:0
> collisions:0 txqueuelen:100
> RX bytes:272871106 (260.2 Mb) TX bytes:94124015 (89.7
Mb)
> Interrupt:10 Base address:0xa800 Memory:ee800000-ee800038
>
> eth0:1 Link encap:Ethernet HWaddr 00:E0:18:05:A9:68
> inet addr:192.168.10.1 Bcast:192.168.10.255
Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:440089 errors:0 dropped:0 overruns:0 frame:0
> TX packets:409012 errors:0 dropped:0 overruns:1 carrier:0
> collisions:0 txqueuelen:100
> RX bytes:272871106 (260.2 Mb) TX bytes:94124015 (89.7
Mb)
> Interrupt:10 Base address:0xa800 Memory:ee800000-ee800038
>
> and IP forwarding is turned on:
>
> # sysctl net.ipv4.ip_forward
> net.ipv4.ip_forward = 1
>
> DHCP is setup thusly (/etc/dhcpd.conf):
>
> default-lease-time 600;
> max-lease-time 7200;
> option subnet-mask 255.255.255.0;
> option broadcast-address 192.168.10.255;
> option routers 192.168.10.1;
> option domain-name-servers 64.166.134.117, 206.13.12.28,
206.13.31.12;
> option domain-name "leonora.org";
> ddns-update-style ad-hoc;
>
> subnet 192.168.10.0 netmask 255.255.255.0 {
> range 192.168.10.2 192.168.10.254;
> host laptop1 {
> hardware ethernet 00:0b:db:1b:ca:5a;
> fixed-address 192.168.10.109;
> }
> host laptop2 {
> hardware ethernet 00:10:a4:03:dc:45;
> fixed-address 192.168.10.127;
> }
> }
>
> I've entered the necessary mumbo-jumbo for iptables to work with my
new
> eth0:1 interface, but I get the same behavior (no access from laptops
> to the Internet) even if I turn iptables off.
>
> Concentrating on laptop1, the Linux laptop, for the moment... The last
> entry in laptop1's dhcp lease looks like this:
>
> lease {
> interface "eth0";
> fixed-address 192.168.10.109;
> option subnet-mask 255.255.255.0;
> option routers 192.168.10.1;
> option dhcp-lease-time 600;
> option dhcp-message-type 5;
> option domain-name-servers
64.166.134.117,206.13.12.28,206.13.31.12;
> option dhcp-server-identifier 64.166.134.117;
> option broadcast-address 192.168.10.255;
> option domain-name "leonora.org";
> renew 0 2003/11/9 19:22:16;
> rebind 0 2003/11/9 19:26:27;
> expire 0 2003/11/9 19:27:42;
> }
>
> Its Ethernet interface is:
>
> eth0 Link encap:Ethernet HWaddr 00:0B:DB:1B:CA:5A
> inet addr:192.168.10.109 Bcast:192.168.10.255
Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:128741 errors:0 dropped:0 overruns:0 frame:0
> TX packets:228979 errors:0 dropped:0 overruns:0 carrier:2
> collisions:0 txqueuelen:100
> RX bytes:10101993 (9.6 Mb) TX bytes:287682017 (274.3 Mb)
> Interrupt:10 Memory:e0100000-e0101080
>
> and its routing table is:
>
> Destination Gateway Genmask Flags Metric Ref
Use Iface
> 192.168.10.0 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
> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0
0 lo
> 0.0.0.0 192.168.10.1 0.0.0.0 UG 0 0
0 eth0
>
> Hmmm. no host entry, but adding one with
>
> route add -host 192.168.10.109 eth0
>
> didn't change any behavior I could detect.
>
> So, everything looks OK to me and I've exhausted my knowledge. Any
suggestions?
When you ping from a laptop to the internet, the source will be a
private address and it
has to be routed back to you. Are you doing NAT anywhere?
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