nfsd/portmapper and iptables on Linux 4

[James Cooley]

ypserv is another RPC based service, so it usually binds to a random 
port.  However, it can take the -p option at startup to specify the 
port, so you can probably edit /etc/init.d/ypserv find the start) 
section and specify the -p option followed by the port you want to use.

Give that a try and see if it works for you.

Thanks,
James Cooley



On Mar 10, 2005, at 6:28 PM, Ben Ransom wrote:

> Cool, thanks a lot.
> Similar question now tho ...I see that ypbind on clients also cannot 
> find ypserv on the Redhat 4 machine (again, it is the firewall 
> blocking ports).   Is there a similar solution for this?  (or 
> dissimilar, i don't much care :)  )
> -Ben
>
> At 03:21 PM 3/10/2005 -0500, you wrote:
>> Yes. I know this problem well :) There are a couple of RPC services 
>> in addition to portmapper and nfs (rquotad and mountd) used by NFS 
>> that bind to a random port at startup.
>>
>> The solution is to add the ports to your /etc/services file such as 
>> the following:
>> rquotad 950/tcp
>> rquotad 950/udp
>> mount 951/tcp
>> mount 951/udp
>>
>> Restart nfs, and those two services will bind to the ports specified. 
>> Just add those ports to your firewall rules and you should be in 
>> business.
>>
>>
>> I hope that helps.
>>
>>
>> Thanks,
>>
>>
>> --
>> --
>> James Cooley
>> Sr. Systems Analyst
>> Information Technology
>> Florida Tech
>> 321-674-7999
>> jcooley at it.fit.edu
>>
>>
>>
>>
>>
>>
>>
>> Ben Ransom wrote:
>>
>>> I've just put up a Redhat 4 system (call it nfsServer) and am unable 
>>> to nfs mount file systems from it on other machines ...unless I turn 
>>> off iptables on nfsServer.
>>>
>>> I think the problem is the client is unable to see portmapper on 
>>> nfsServer. In the past I've opened udp ports 111 and 2049 in 
>>> iptables but this doesn't do the trick with the Redhat4 box. Note, I 
>>> had SELinux turned on but have disabled it for now.
>>>
>>> Any suggestions?
>>> Thanks,
>>> -Ben
>>
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