Routing problem

Hi,

I'm trying to use Linux as a small router but it is probably not my day :)
this is the configuration I have:

+------+
| O |
+------+
|172.17.2.3
|
|
|172.17.2.30 Masquerade t this interface
+--------------+
| A - Linux |
+--------------+
|172.16.0.1
|
|
+------+172.16.0.2 | 172.16.0.10+------+172.30.0.1 172.30.0.10+------+
| B |--------------------------| C |--------------------------| D |
+------+ 255.255.0.0 +------+ 255.255.0.0 +------+

interface I have:
eth0 Link encap:Ethernet HWaddr 00:E0:72:A0:03:1F
inet addr:172.17.2.30 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:821 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:75201 (73.4 kiB) TX bytes:1306 (1.2 kiB)
Base address:0x8500

eth1 Link encap:Ethernet HWaddr 00:E0:72:A0:03:10
inet addr:172.16.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:58 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:9209 (8.9 kiB) TX bytes:0 (0.0 iB)
Base address:0x8400

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:283 errors:0 dropped:0 overruns:0 frame:0
TX packets:283 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:82004 (80.0 kiB) TX bytes:82004 (80.0 kiB)


this is the perliminary routing table I had:
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
172.16.0.0 0.0.0.0 255.255.0.0 U 40 0 0 eth1
172.17.0.0 0.0.0.0 255.255.0.0 U 40 0 0 eth0
0.0.0.0 172.17.1.10 0.0.0.0 UG 40 0 0 eth0

I add the next route:
route add -net 172.30.0.0 netmask 255.255.0.0 gw 172.16.0.10

so now I have the next routing table:
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
172.30.0.0 172.16.0.10 255.255.0.0 UG 40 0 0 eth1
172.16.0.0 0.0.0.0 255.255.0.0 U 40 0 0 eth1
172.17.0.0 0.0.0.0 255.255.0.0 U 40 0 0 eth0
0.0.0.0 172.17.1.10 0.0.0.0 UG 40 0 0 eth0


Connection test using ping:
A --> loopbak : OK
A --> O : OK
A --> B : OK
A --> C : OK
A --> D : OK
-
C --> *All* : OK
-
B --> A : OK
B --> O : OK
B --> C(172.16.0.10) : OK
B --> C(172.30.0.1) : Fail
B --> D : Fail

1. The default router for B is A.
2. All the stations except A are Win2K/Win9X


Any idea what I should do so that B can get to D?

Best Regards

Yehoram Ben-Yaacov
yben@boscom.com

On 9 Sep 2003 05:14:23 -0700, Yehoram B.Y. <yben@boscom.com> wrote:
> Hi,
>
> I'm trying to use Linux as a small router but it is probably not my day :)
> this is the configuration I have:
>
> +------+
> | O |
> +------+
> |172.17.2.3
> |
> |
> |172.17.2.30 Masquerade t this interface
> +--------------+
> | A - Linux |
> +--------------+
> |172.16.0.1
> |
> |
> +------+172.16.0.2 | 172.16.0.10+------+172.30.0.1 172.30.0.10+------+
>| B |--------------------------| C |--------------------------| D |
> +------+ 255.255.0.0 +------+ 255.255.0.0 +------+
>
> interface I have:
> eth0 Link encap:Ethernet HWaddr 00:E0:72:A0:03:1F
> inet addr:172.17.2.30 Bcast:172.17.255.255 Mask:255.255.0.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:821 errors:0 dropped:0 overruns:0 frame:0
> TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:100
> RX bytes:75201 (73.4 kiB) TX bytes:1306 (1.2 kiB)
> Base address:0x8500
>
> eth1 Link encap:Ethernet HWaddr 00:E0:72:A0:03:10
> inet addr:172.16.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:58 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:100
> RX bytes:9209 (8.9 kiB) TX bytes:0 (0.0 iB)
> Base address:0x8400

eth1 broadcast is wrong, should be 172.16.255.255

> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:283 errors:0 dropped:0 overruns:0 frame:0
> TX packets:283 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:82004 (80.0 kiB) TX bytes:82004 (80.0 kiB)
>
>
> this is the perliminary routing table I had:
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window irtt Iface
> 172.16.0.0 0.0.0.0 255.255.0.0 U 40 0 0 eth1
> 172.17.0.0 0.0.0.0 255.255.0.0 U 40 0 0 eth0
> 0.0.0.0 172.17.1.10 0.0.0.0 UG 40 0 0 eth0
>
> I add the next route:
> route add -net 172.30.0.0 netmask 255.255.0.0 gw 172.16.0.10
>
> so now I have the next routing table:
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window irtt Iface
> 172.30.0.0 172.16.0.10 255.255.0.0 UG 40 0 0 eth1
> 172.16.0.0 0.0.0.0 255.255.0.0 U 40 0 0 eth1
> 172.17.0.0 0.0.0.0 255.255.0.0 U 40 0 0 eth0
> 0.0.0.0 172.17.1.10 0.0.0.0 UG 40 0 0 eth0
>
>
> Connection test using ping:
> A --> loopbak : OK
> A --> O : OK
> A --> B : OK
> A --> C : OK
> A --> D : OK
> -
> C --> *All* : OK
> -
> B --> A : OK
> B --> O : OK
> B --> C(172.16.0.10) : OK
> B --> C(172.30.0.1) : Fail
> B --> D : Fail
>
> 1. The default router for B is A.
> 2. All the stations except A are Win2K/Win9X
>
>
> Any idea what I should do so that B can get to D?

B would need a gw to 172.16.0.10 for 172.30.0.0/16 network. Or since some
Win versions are not too specific maybe you just need to add 172.16.0.10
to its list of gateways. Otherwise B would not know what to try if
172.16.0.1 gateway fails.

--
David Efflandt - All spam ignored http://www.de-srv.com/
http://www.autox.chicago.il.us/ http://www.berniesfloral.net/
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yben@boscom.com (Yehoram B.Y.) wrote in
news:4149929c.0309090414.57a4c2c@posting.google.co m:

> Hi,
>
<SNIP>

>
> Any idea what I should do so that B can get to D?
>

Do a traceroute to the 172.30.x.x address and see where it is falling
over.

L.

> Best Regards
>
> Yehoram Ben-Yaacov
> yben@boscom.com