dhcp client recommendations

[Pallissard, Matthew-2]

Hello,

We're currently setting up ISC dhcpd/ddns for use in our data center.  Everything server side functions exactly as expected.  Client side is where we have questions, so forgive me if this is the wrong place to ask.  In the case of a dhcp server failure, we were hoping to have clients (CentOS 6/7, Ubuntu 14/16/18.04) retry indefinitely.

We've done some research into dhclient and NetworkManager but have yet to find a straightforward answer in the man pages/google searches.  This leads me to two questions.

1. Does anyone know how to accomplish this or have other recommendations?
2. The lack of straightforward answers has me wondering; should I be rethinking my problem or approaching it from a different angle?


Thanks in advance.

Matt Pallissard

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[John Miller]

Hi Matt,

What sort of lease time are you thinking about giving your clients?
With indefinite retries, are you trying to solve the problem of:

* Clients receiving IPs at boot time before services have started
* Clients renewing their leases post-boot with services running?

John
On Thu, Oct 18, 2018 at 4:15 PM Pallissard, Matthew <[hidden email]> wrote:

>
> Hello,
>
> We're currently setting up ISC dhcpd/ddns for use in our data center.  Everything server side functions exactly as expected.  Client side is where we have questions, so forgive me if this is the wrong place to ask.  In the case of a dhcp server failure, we were hoping to have clients (CentOS 6/7, Ubuntu 14/16/18.04) retry indefinitely.
>
> We've done some research into dhclient and NetworkManager but have yet to find a straightforward answer in the man pages/google searches.  This leads me to two questions.
>
> 1. Does anyone know how to accomplish this or have other recommendations?
> 2. The lack of straightforward answers has me wondering; should I be rethinking my problem or approaching it from a different angle?
>
>
> Thanks in advance.
>
> Matt Pallissard
> _______________________________________________
> dhcp-users mailing list
> [hidden email]
> https://lists.isc.org/mailman/listinfo/dhcp-users

--
John Miller
Senior Systems Engineer
Brandeis University ITS
[hidden email]
[phone]
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[Pallissard, Matthew-2]

John, responses in line


On 2018-10-18T17:58:36, John Miller wrote:
> Hi Matt,
>
> What sort of lease time are you thinking about giving your clients?
> With indefinite retries, are you trying to solve the problem of:

Very long lease times.  The exact length is still TBD, but probably as long as we can sanely extend them.


> * Clients receiving IPs at boot time before services have started
> * Clients renewing their leases post-boot with services running?

We're looking at the latter.   We're trying to have clients keep attempting to obtain addresses indefinitely in the [unlikely] event that the dhcp server becomes unreachable.

Matt Pallissard

> John
> On Thu, Oct 18, 2018 at 4:15 PM Pallissard, Matthew <[hidden email]> wrote:
> >
> > Hello,
> >
> > We're currently setting up ISC dhcpd/ddns for use in our data center.  Everything server side functions exactly as expected.  Client side is where we have questions, so forgive me if this is the wrong place to ask.  In the case of a dhcp server failure, we were hoping to have clients (CentOS 6/7, Ubuntu 14/16/18.04) retry indefinitely.
> >
> > We've done some research into dhclient and NetworkManager but have yet to find a straightforward answer in the man pages/google searches.  This leads me to two questions.
> >
> > 1. Does anyone know how to accomplish this or have other recommendations?
> > 2. The lack of straightforward answers has me wondering; should I be rethinking my problem or approaching it from a different angle?
> >
> >
> > Thanks in advance.
> >
> > Matt Pallissard
> > _______________________________________________
> > dhcp-users mailing list
> > [hidden email]
> > https://lists.isc.org/mailman/listinfo/dhcp-users
>
>
>
> --
> John Miller
> Senior Systems Engineer
> Brandeis University ITS
> [hidden email]
> [phone]
> _______________________________________________
> dhcp-users mailing list
> [hidden email]
> https://lists.isc.org/mailman/listinfo/dhcp-users

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[Leroy Tennison]

If the context is critical infrastructure I would suggest setting up a failover DHCP and making this a non-issue.


Leroy Tennison
Network Information/Cyber Security Specialist
E: [hidden email]
2220 Bush Dr
McKinney, Texas
75070
www.datavoiceint.com
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________________________________________
From: dhcp-users <[hidden email]> on behalf of Pallissard, Matthew <[hidden email]>
Sent: Thursday, October 18, 2018 3:15 PM
To: [hidden email]
Subject: [EXTERNAL] dhcp client recommendations

Hello,

We're currently setting up ISC dhcpd/ddns for use in our data center.  Everything server side functions exactly as expected.  Client side is where we have questions, so forgive me if this is the wrong place to ask.  In the case of a dhcp server failure, we were hoping to have clients (CentOS 6/7, Ubuntu 14/16/18.04) retry indefinitely.

We've done some research into dhclient and NetworkManager but have yet to find a straightforward answer in the man pages/google searches.  This leads me to two questions.

1. Does anyone know how to accomplish this or have other recommendations?
2. The lack of straightforward answers has me wondering; should I be rethinking my problem or approaching it from a different angle?


Thanks in advance.

Matt Pallissard
_______________________________________________
dhcp-users mailing list
[hidden email]
https://lists.isc.org/mailman/listinfo/dhcp-users

[Pallissard, Matthew-2]

> If the context is critical infrastructure I would suggest setting up a failover DHCP and making this a non-issue.

It is, and we are.  The overall goal is to have things recover if there were some sort of catastrophic failure.

Matt Pallissard.

On 2018-10-19T19:51:33, Leroy Tennison wrote:

> If the context is critical infrastructure I would suggest setting up a failover DHCP and making this a non-issue.
>
>
> Leroy Tennison
> Network Information/Cyber Security Specialist
> E: [hidden email]
> 2220 Bush Dr
> McKinney, Texas
> 75070
> www.datavoiceint.com
> TThis message has been sent on behalf
> of a company that is part of the Harris Operating Group of
> Constellation Software Inc. These companies are listed
> here
> .
> If you prefer not to be contacted by Harris
> Operating Group
> please notify us
> .
> This message is intended exclusively for the
> individual or entity to which it is addressed. This communication
> may contain information that is proprietary, privileged or
> confidential or otherwise legally exempt from disclosure. If you are
> not the named addressee, you are not authorized to read, print,
> retain, copy or disseminate this message or any part of it. If you
> have received this message in error, please notify the sender
> immediately by e-mail and delete all copies of the
> message.
>
> ________________________________________
> From: dhcp-users <[hidden email]> on behalf of Pallissard, Matthew <[hidden email]>
> Sent: Thursday, October 18, 2018 3:15 PM
> To: [hidden email]
> Subject: [EXTERNAL] dhcp client recommendations
>
> Hello,
>
> We're currently setting up ISC dhcpd/ddns for use in our data center.  Everything server side functions exactly as expected.  Client side is where we have questions, so forgive me if this is the wrong place to ask.  In the case of a dhcp server failure, we were hoping to have clients (CentOS 6/7, Ubuntu 14/16/18.04) retry indefinitely.
>
> We've done some research into dhclient and NetworkManager but have yet to find a straightforward answer in the man pages/google searches.  This leads me to two questions.
>
> 1. Does anyone know how to accomplish this or have other recommendations?
> 2. The lack of straightforward answers has me wondering; should I be rethinking my problem or approaching it from a different angle?
>
>
> Thanks in advance.
>
> Matt Pallissard
> _______________________________________________
> dhcp-users mailing list
> [hidden email]
> https://lists.isc.org/mailman/listinfo/dhcp-users

_______________________________________________
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