MOUNT failed to NFS

Hi,

I configed my XP as a router so that my development board talk to
LINUX box, XP and LINUX box are both hooked to company network.

I can do nc through port 2049 and other ports. but when I tried to
mount from the development board to LINUX box, it gave error: mount:
RPC Timed out. I know my NFS server is correct, I tried to mount
through NFS from other machines, they are correct.

So, problem is from my development board or the router. But I can do
nc to transfer files over the 2049 port. The problem is definitely
from my board? any idea how to dig in?

I even monitoed the traffic on my XP network card, it never received
the traffic from my board though? Could it be possible my company's
firewall are blocking NFS? how come the 2049 port is still OK in this
case?


thanks
patrick

PZ wrote:
> Hi,
>
> I configed my XP as a router so that my development board talk to
> LINUX box, XP and LINUX box are both hooked to company network.
>
> I can do nc through port 2049 and other ports. but when I tried to
> mount from the development board to LINUX box, it gave error: mount:
> RPC Timed out. I know my NFS server is correct, I tried to mount
> through NFS from other machines, they are correct.
>
> So, problem is from my development board or the router. But I can do
> nc to transfer files over the 2049 port. The problem is definitely
> from my board? any idea how to dig in?
>
> I even monitoed the traffic on my XP network card, it never received
> the traffic from my board though? Could it be possible my company's
> firewall are blocking NFS? how come the 2049 port is still OK in this
> case?

The firewall may block just ports between 1 and 1024 (service ports).
try to connect via `telnet <NFS-Host-IP> 111`. If your output is like
Trying <Host-IP>...
Connected to <hostname>.
Escape character is '^]'.

the connection is ok, otherwise there might be an access or firewall
problem. Do you see the packages from your XP box arriving at the NFS box?

tcpdump -vvv -i <external-interface> dst port 22 and src <XP-host-IP>
i.E.
tcpdump -vvv -i eth0 dst port 22 and src www.xxx.yyy.zzz

If you get an output for port 22, it might be an access problem.

Eric

Eric wrote:
> PZ wrote:
>> Hi,
>>
>> I configed my XP as a router so that my development board talk to
>> LINUX box, XP and LINUX box are both hooked to company network.
>>
>> I can do nc through port 2049 and other ports. but when I tried to
>> mount from the development board to LINUX box, it gave error: mount:
>> RPC Timed out. I know my NFS server is correct, I tried to mount
>> through NFS from other machines, they are correct.
>>
>> So, problem is from my development board or the router. But I can do
>> nc to transfer files over the 2049 port. The problem is definitely
>> from my board? any idea how to dig in?
>>
>> I even monitoed the traffic on my XP network card, it never received
>> the traffic from my board though? Could it be possible my company's
>> firewall are blocking NFS? how come the 2049 port is still OK in this
>> case?
>
> The firewall may block just ports between 1 and 1024 (service ports).
> try to connect via `telnet <NFS-Host-IP> 111`. If your output is like
> Trying <Host-IP>...
> Connected to <hostname>.
> Escape character is '^]'.
>
> the connection is ok, otherwise there might be an access or firewall
> problem. Do you see the packages from your XP box arriving at the NFS box?
>
> tcpdump -vvv -i <external-interface> dst port 22 and src <XP-host-IP>
> i.E.
> tcpdump -vvv -i eth0 dst port 22 and src www.xxx.yyy.zzz
>
> If you get an output for port 22, it might be an access problem.

It would also be interesting if any traffic from the firewall is
received for that service at the SSHD server.

tcpdump -vvv -i <device> dst port 22 and src <firewall-IP>

Eric

Eric wrote:
> Eric wrote:
>> PZ wrote:
>>> Hi,
>>>
>>> I configed my XP as a router so that my development board talk to
>>> LINUX box, XP and LINUX box are both hooked to company network.
>>>
>>> I can do nc through port 2049 and other ports. but when I tried to
>>> mount from the development board to LINUX box, it gave error: mount:
>>> RPC Timed out. I know my NFS server is correct, I tried to mount
>>> through NFS from other machines, they are correct.
>>>
>>> So, problem is from my development board or the router. But I can do
>>> nc to transfer files over the 2049 port. The problem is definitely
>>> from my board? any idea how to dig in?
>>>
>>> I even monitoed the traffic on my XP network card, it never received
>>> the traffic from my board though? Could it be possible my company's
>>> firewall are blocking NFS? how come the 2049 port is still OK in this
>>> case?
>> The firewall may block just ports between 1 and 1024 (service ports).
>> try to connect via `telnet <NFS-Host-IP> 111`. If your output is like
>> Trying <Host-IP>...
>> Connected to <hostname>.
>> Escape character is '^]'.
>>
>> the connection is ok, otherwise there might be an access or firewall
>> problem. Do you see the packages from your XP box arriving at the NFS box?
>>
>> tcpdump -vvv -i <external-interface> dst port 22 and src <XP-host-IP>
>> i.E.
>> tcpdump -vvv -i eth0 dst port 22 and src www.xxx.yyy.zzz
>>
>> If you get an output for port 22, it might be an access problem.
>
> It would also be interesting if any traffic from the firewall is
> received for that service at the SSHD server.
>
> tcpdump -vvv -i <device> dst port 22 and src <firewall-IP>

Sorry, of course i mean dst port 111 instead of 22.

Eric