phosphor-network: does it make sense to disable systemd-networkd sending DHCP release?

phosphor-network: does it make sense to disable systemd-networkd sending DHCP release?

[Heyi Guo]

Hi all,

Now systemd-networkd will send DHCP release packet when BMC reboots. 
This may cause BMC to lose its original aquired IP after next boot up. I 
see this feature can be disabled by adding below lines to the 
configuration file of systemd-networkd:

[DHCPv4]
SendRelease=false

Does it make sense to disable DHCP release? Or is there any reason for 
the current default configuration in phosphor-network?

Thanks,

Heyi

Re: phosphor-network: does it make sense to disable systemd-networkd sending DHCP release?

[Johnathan Mantey]

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On 2/21/22 01:05, Heyi Guo wrote:
> Hi all,
>
> Now systemd-networkd will send DHCP release packet when BMC reboots. 
> This may cause BMC to lose its original aquired IP after next boot up. 
> I see this feature can be disabled by adding below lines to the 
> configuration file of systemd-networkd:
>
> [DHCPv4]
> SendRelease=false
>
> Does it make sense to disable DHCP release? Or is there any reason for 
> the current default configuration in phosphor-network?
>
> Thanks,
>
> Heyi
>

FWIW, users within Intel get very cranky when their IPv4 addresses 
change. I'm presently working on a defect related to the IP address 
being altered.

As it is unclear there is a run-time mechanism for changing this value, 
I'd at least like to see a compile time control. I expect Intel will 
choose to block sending a DHCP release request for when the BMC reboots.


-- 
Johnathan Mantey
Senior Software Engineer
*azad te**chnology partners*
Contributing to Technology Innovation since 1992
Phone: (503) 712-6764
Email: johnathanx.mantey@intel.com


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Re: phosphor-network: does it make sense to disable systemd-networkd sending DHCP release?

[Heyi Guo]

Hi Johnathan,

Thanks for your feedback; I'll try to make a patch for that.

Heyi

在 2022/3/2 下午11:50, Johnathan Mantey 写道:
>
> On 2/21/22 01:05, Heyi Guo wrote:
>> Hi all,
>>
>> Now systemd-networkd will send DHCP release packet when BMC reboots. 
>> This may cause BMC to lose its original aquired IP after next boot 
>> up. I see this feature can be disabled by adding below lines to the 
>> configuration file of systemd-networkd:
>>
>> [DHCPv4]
>> SendRelease=false
>>
>> Does it make sense to disable DHCP release? Or is there any reason 
>> for the current default configuration in phosphor-network?
>>
>> Thanks,
>>
>> Heyi
>>
>
> FWIW, users within Intel get very cranky when their IPv4 addresses 
> change. I'm presently working on a defect related to the IP address 
> being altered.
>
> As it is unclear there is a run-time mechanism for changing this 
> value, I'd at least like to see a compile time control. I expect Intel 
> will choose to block sending a DHCP release request for when the BMC 
> reboots.
>
>