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IDS Forum

Re: Connections from Linux client take a long ....

Posted By: Eric Rowell
Date: Monday, 29 January 2018, at 10:57 p.m.

In Response To: Re: Connections from Linux client take a long .... (Fernando Nunes)

Ran into this as well on AIX and Linux.

The environment variable worked like a charm but I view it as a work around for poor configuration.

In the /etc/nsswitch.conf if there is a BIND or BIND6 option on the hosts line it will try to resolve using IPv6 if available. Changing to BIND4 forces it to only resolve using IPv4. Better than maintaining host files on each system which is what happen if you disable BIND all together. Adding to the host file with BIND set did not help in my experience as it waited for response from all verse using the first available (might be able to configure this but found it unnecessary).

What causes the issue? If the DNS system is not setup properly for the IPv6 or the system should not have IPv6 enabled this could be the source.

Examples:
In my one of my cases the system should not have IPv6 set and removing it from the nic fix the problem as there was not IPv6 network to check (Linux).
In another the system admin wanted IPv6 but our DNS is not setup to allow resolution so we changed to BIND4 (AIX).

Sadly I dont have a setup where IPv6 resolves to anything but look forward to the day.

Hope this helps,
Eric Rowell

> On Jan 29, 2018, at 09:33, Fernando Nunes <domusonline@gmail.com> wrote:
>
> It's for sure an issue with reverse DNS.
> You can try:
> 1- Edit /etc/nsswitch.conf and on the "hosts:" entry leave only "files"
> 2- Set IFX_DISABLE_IPV6 environment variable on the server side and restart
> the engine (if you don't plan to use IPV6)
> 3- Properly configure your DNS infra-structure
>
> Regards.
>
>> On Mon, Jan 29, 2018 at 9:11 AM, Clive Eisen <clive@serendipita.com> wrote:
>>
>> Did you do it at both ends
>>
>> ie the server name/ip in the client hosts
>> and the client name/ip in the server hosts?
>>
>> I suspect its the reverse dns lookup on the server
>>
>> Clive
>>
>>> On 29 Jan 2018, at 04:18, Justin Killen <jkillen@allamericanasphalt.com>
>> wrote:
>>>
>>> I tried that, but no change
>>>
>>>> On Jan 28, 2018, at 4:00 PM, Ben Duncan <linux4ms@aim.com> wrote:
>>>>
>>>> If it is on the network connection, try adding an entry in the
>> /etc/hosts
>>>> file for the quest connection.
>>>>
>>>>> On 01/28/2018 05:42 PM, Jack Parker wrote:
>>>>> Is one using a shared memory connection and the other a network
>> connection?
>>>>>
>>>>> j.
>>>>>
>>>>>> On Jan 28, 2018, at 6:36 PM, Justin Killen
>>> <jkillen@allamericanasphalt.com>
>>>>> wrote:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I have a Linux server that seems to take a long time to make
>> connections.
>>>> On
>>>>> a
>>>>>> working (AIX) server, I get this:
>>>>>>
>>>>>> time echo "SELECT CURRENT FROM systables WHERE tabid=1;" | dbaccess
>>>>> rmca_test
>>>>>> -
>>>>>>
>>>>>> Database selected.
>>>>>>
>>>>>> (expression)
>>>>>>
>>>>>> 2018-01-28 14:44:16.000
>>>>>>
>>>>>> 1 row(s) retrieved.
>>>>>>
>>>>>> Database closed.
>>>>>>
>>>>>> real 0m0.04s
>>>>>> user 0m0.02s
>>>>>> sys 0m0.01s
>>>>>>
>>>>>> whereas on the Linux server, I get this:
>>>>>>
>>>>>> time echo "SELECT CURRENT FROM systables WHERE tabid=1;" | dbaccess
>>>>> sysmaster
>>>>>> -
>>>>>>
>>>>>> Database selected.
>>>>>>
>>>>>> (expression)
>>>>>>
>>>>>> 2018-01-28 14:44:09.000
>>>>>>
>>>>>> 1 row(s) retrieved.
>>>>>>
>>>>>> Database closed.
>>>>>>
>>>>>> real 0m2.477s
>>>>>> user 0m0.012s
>>>>>> sys 0m0.002s
>>>>>>
>>>>>> Any thoughts on where I should start looking?
>>>>>>
>>>>>> Thanks,
>>>>>> -Justin
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>> ************************************************************
>> *******************
>>>>>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>> ************************************************************
>> *******************
>>>>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>>>>
>>>>
>>>>
>>>>
>>>
>> ************************************************************
>> *******************
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>>>>
>>>
>>>
>>>
>> ************************************************************
>> *******************
>>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>>
>>
>>
>> ************************************************************
>> *******************
>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>
>>
>
> --
> Fernando Nunes
> Portugal
>
> http://informix-technology.blogspot.com
> My email works... but I don't check it frequently...
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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