Tauno Voipio escreveu:
> Fernando Vaz wrote:
>
>> Hello folks,
>>
>> I'm trying to set up a home network, using an older PC as a
>> gateway/apache server. The connection between both boxes works fine,
>> and the gateway connects to the internet fine (ADSL ppp0 connection,
>> it pings out of my net ok). All the NAT modules are loaded, I have
>> cleared all firewall rules, but still the machine behind the gateway
>> can't ping anywhere past the gateway. ipv4_forward is set to 1. I'll
>> try to draw a diagram:
>>
>>
>> | |
>> | internet |
>> |_____________|
>> |
>> |
>> \/
>> -------------------
>> |ppp0(valid ip) |
>> | /\ |
>> | | |
>> | \/ |
>> |eth0 (ip 0.0.0.0)|
>> | /\ |
>> | | |
>> | \/ |
>> |eth1(192.168.0.2)|
>> |_________________|
>> /\
>> |
>> \/
>> -------------------
>> |eth0(192.168.0.5)|
>> |gw 192.168.0.2) |
>> |_________________|
>>
>> Is it something to do with my routes? Please help, I've been
>> struggling over this for quite a few days, and I'm pretty sure "im
>> missing out on something really dumb...
>
>
> Please post:
>
> - the kernel version (uname -a)
>
> - the output of
> ifconfig -a
>
> - the output of
> route -n
>
> - the output of
> iptables -nvL
> or
> ipchains -nvL
>
> of the gateway host, so we do not need to guess so much.
>
> Tauno Voipio
> tauno voipio (at) iki fi
>

Here's the rest of the info, as requested:

The desktop box:
Linux garrido.localdomain 2.6.5-63255U10_3cl #1 Fri Sep 10 21:24:34 BRT
2004 i686 unknown unknown GNU/Linux
Conectiva Linux 10
NVidia NForce2 Onboard NIC
Athlon XP 2500+

eth0 Encapsulamento do Link: Ethernet Endereço de HW
00:E0:4C:C6:FA:94
inet end.: 192.168.0.5 Bcast:192.168.0.255 Masc:255.255.255.0
UP BROADCASTRUNNING MULTICAST MTU:1500 Métrica:1
pacotes RX:172 erros:0 descart.:0 sobrepos.:0 quadro:0
pacotes TX:377 erros:0 descart.:0 sobrepos.:0 portadora:0
colisões:0 txqueuelen:1000
RX bytes:22431 (21.9 Kb) TX bytes:28346 (27.6 Kb)
IRQ:177 Endereço de E/S:0x4000

Tabela de Roteamento IP do Kernel
Destino Roteador MáscaraGen. Opções Métrica Ref Uso
Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.0.2 0.0.0.0 UG 0 0 0 eth0

--------------------------------------------------------------------------------

Gateway host:

Linux gaws.localdomain 2.6.5-63077cl #1 Thu Jun 17 18:42:25 BRT 2004
i686 unknown unknown GNU/Linux
Conectiva Linux 10
Realtek 8139 NIC
3Com 359x NIC
PII 333MHz

eth0 Encapsulamento do Link: Ethernet Endereço de HW 00:02:E3:0E:EB:CA
UP BROADCASTRUNNING MULTICAST MTU:1500 Métrica:1
pacotes RX:199 erros:0 descart.:0 sobrepos.:0 quadro:0
pacotes TX:203 erros:0 descart.:0 sobrepos.:0 portadora:0
colisões:0 txqueuelen:1000
RX bytes:15124 (14.7 Kb) TX bytes:13013 (12.7 Kb)
IRQ:10 Endereço de E/S:0xe00

eth1 Encapsulamento do Link: Ethernet Endereço de HW 00:50:04:AA:8A:42
inet end.: 192.168.0.2 Bcast:192.168.0.255 Masc:255.255.255.0
UP BROADCASTRUNNING MULTICAST MTU:1500 Métrica:1
pacotes RX:420 erros:0 descart.:0 sobrepos.:0 quadro:0
pacotes TX:192 erros:0 descart.:0 sobrepos.:0 portadora:0
colisões:0 txqueuelen:1000
RX bytes:34314 (33.5 Kb) TX bytes:24603 (24.0 Kb)
IRQ:9 Endereço de E/S:0xdc00

ppp0 Encapsulamento do Link: Protocolo Ponto-a-Ponto
inet end.: 200.193.12.80 P-a-P:200.138.225.254
Masc:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Métrica:1
pacotes RX:142 erros:0 descart.:0 sobrepos.:0 quadro:0
pacotes TX:148 erros:0 descart.:0 sobrepos.:0 portadora:0
colisões:0 txqueuelen:3
RX bytes:8478 (8.2 Kb) TX bytes:6364 (6.2 Kb)

Tabela de Roteamento IP do Kernel
Destino Roteador MáscaraGen. Opções Métrica Ref Uso
Iface
200.138.225.254 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
0.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 200.138.225.254 0.0.0.0 UG 0 0 0 ppp0

Chain INPUT (policy ACCEPT 73 packets, 6668 bytes)
pkts bytes target prot opt in out source
destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source
destination
0 0 ACCEPT all -- * eth0 192.168.0.0/24
0.0.0.0/0
0 0 ACCEPT all -- eth1 eth0 0.0.0.0/0
0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT all -- eth0 eth1 0.0.0.0/0
0.0.0.0/0
0 0 ACCEPT all -- eth0 eth1 0.0.0.0/0
0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT all -- eth1 eth0 0.0.0.0/0
0.0.0.0/0

Chain OUTPUT (policy ACCEPT 48 packets, 5753 bytes)
pkts bytes target prot opt in out source
destination
0 0 ACCEPT all -- * eth0 192.168.0.0/24
0.0.0.0/0