Activating routing

Hello.

I have two machines, slick and swift. They communicate over a WIFI link
(both are set in Ad-Hoc mode), using addresses 192.168.1.3 for swift and
192.168.1.4 for slick. I can ssh from one to the other without trouble.

swift is connected to the internet through an ethernet cable to a DSL modem.

I'd like it to act as a router for slick.

I have installed and started dnsmaq on swift, which acts as a DNS server for
slick (this works).

However, I can't ping google.com from slick. It is served an IP, but can't
reach its destination:

fab@slick:~$ ping google.com
PING google.com (64.233.187.99) 56(84) bytes of data.
From swift.airforce-one.org (192.168.1.3): icmp_seq=1 Redirect Host(New nexthop: 192.168.1.254)
From swift.airforce-one.org (192.168.1.3): icmp_seq=2 Redirect Host(New nexthop: 192.168.1.254)
From swift.airforce-one.org (192.168.1.3): icmp_seq=3 Redirect Host(New nexthop: 192.168.1.254)
From swift.airforce-one.org (192.168.1.3) icmp_seq=1 Destination Host Unreachable
From swift.airforce-one.org (192.168.1.3) icmp_seq=2 Destination Host Unreachable
From swift.airforce-one.org (192.168.1.3) icmp_seq=3 Destination Host Unreachable
From swift.airforce-one.org (192.168.1.3): icmp_seq=4 Redirect Host(New nexthop: 192.168.1.254)
From swift.airforce-one.org (192.168.1.3): icmp_seq=5 Redirect Host(New nexthop: 192.168.1.254)
From swift.airforce-one.org (192.168.1.3): icmp_seq=6 Redirect Host(New nexthop: 192.168.1.254)
From swift.airforce-one.org (192.168.1.3) icmp_seq=5 Destination Host Unreachable
From swift.airforce-one.org (192.168.1.3) icmp_seq=6 Destination Host Unreachable
From swift.airforce-one.org (192.168.1.3) icmp_seq=7 Destination Host Unreachable
From swift.airforce-one.org (192.168.1.3): icmp_seq=8 Redirect Host(New nexthop: 192.168.1.254)

--- google.com ping statistics ---
9 packets transmitted, 0 received, +6 errors, 100% packet loss, time 8010ms
, pipe 3

Here is slick's routing table:

root@slick:~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 wlan0
loopback * 255.0.0.0 U 0 0 0 lo
default 192.168.1.254 0.0.0.0 UG 0 0 0 wlan0
default swift.airforce- 0.0.0.0 UG 0 0 0 wlan0

and here is swift's routing table:

root@swift:~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
82.230.24.0 * 255.255.255.0 U 0 0 0 eth0
192.168.1.0 * 255.255.255.0 U 0 0 0 ath0
default 192.168.1.254 0.0.0.0 UG 0 0 0 ath0
default 82.230.24.254 0.0.0.0 UG 0 0 0 eth0

Any help? Thanks!

--
Fabrice DELENTE

Moe Trin <(E-Mail Removed)> wrote:
> So - who is 192.168.1.254, and how did that enter the picture?

I entered it myself, out of despair and because I had read about it on a
page somewhere.

I'll try the modifications you suggest, thanks!

--
Fabrice DELENTE

Clifford Kite <(E-Mail Removed)> wrote:
> In addition to Moe's excellent advice be sure ip forwarding is enabled
> on swift:
>
> corncob:~# cat /proc/sys/net/ipv4/ip_forward
> 1

Yes, I did that too, but still can't access the internet from slick... Is
there anything else to configure (I have enable "Advanced route" in the
kernel options)?

Thanks.

--
Fabrice DELENTE

Fabrice Delente wrote:
> Clifford Kite <(E-Mail Removed)> wrote:
>> In addition to Moe's excellent advice be sure ip forwarding is enabled
>> on swift:
>>
>> corncob:~# cat /proc/sys/net/ipv4/ip_forward
>> 1
>
> Yes, I did that too, but still can't access the internet from slick... Is
> there anything else to configure (I have enable "Advanced route" in the
> kernel options)?
>
> Thanks.
>

Use NAT (a.k.a. masquerading) on swift when forwarding packets to/from
slick. As slick uses the private IP number 192.168.1.4 you can't
simply forward slicks packets unmodified to the public internet.


Regards,

Kees.

--
Kees Theunissen.

Kees Theunissen <(E-Mail Removed)> wrote:
> Use NAT (a.k.a. masquerading) on swift when forwarding packets to/from
> slick. As slick uses the private IP number 192.168.1.4 you can't
> simply forward slicks packets unmodified to the public internet.

I've looked into the kernel options but didn't find any optin to activate.
Could you tell me how to do masquerading? Thanks!

--
Fabrice DELENTE