Problems between iphone and dhcp?

johnpoz

@stephenw10 I don't see how even if dhcp was off how that could effect anything in real time..

Could it be the issue with high latency on filter reload of lots of rules? There is a redmine about that and patch available.. But does changing dhcp reload the firewall rules?

stephenw10

Yup, I thought that but it would affect all clients, not just iphones.

johnpoz

@stephenw10 maybe it is and he is just noticing it on the iphones.

edpbettinelli

@stephenw10 said in Problems between iphone and dhcp?:

How exactly does that present? How are you testing? Anything logged in the dhcp log?

it seems that the problem is related to the operations that reload dhcp and also dns resolver. With the company stopped, I try, for example, to reserve a dhcp with Apply and only wifi iphone systematically disappears. At the log level I don't see anything

stephenw10

@edpbettinelli said in Problems between iphone and dhcp?:

and only wifi iphone systematically disappears.

Disappears from where?

Are you seeing disconnections on the iphones?

edpbettinelli

@stephenw10 Sorry i meant iphones respond to ping with other devices in the same vlan but pfsense does not respond to ping for at least 1 minute\

SteveITS

@edpbettinelli said in Problems between iphone and dhcp?:

pfsense does not respond to ping for at least 1 minute

During that minute, does it respond to pings on other interfaces?

stephenw10

@edpbettinelli said in Problems between iphone and dhcp?:

but pfsense does not respond to ping

From the iphones or from other devices? Or both?

edpbettinelli

@steveits said in Problems between iphone and dhcp?:

During that minute, does it respond to pings on other interfaces?

yes, even non-iphone devices on the same vlan respond to pfsense ping

johnpoz

@edpbettinelli are you saying you can not ping an iphone by name when unbound is restarting - this would make sense.

Or are you saying iphone can not ping pfsense IP on the iphone vlan? By IP? By name?

If unbound is restarting - then yeah you could have issues with resolving anything by name.. But that should not effect ping by IP..

Registering dhcp leases in unbound has been problematic for quite some time, because any time a lease is redone or issued it forces a restart of unbound, etc.

SteveITS

@edpbettinelli said in Problems between iphone and dhcp?:

even non-iphone devices on the same vlan respond to pfsense ping

That makes me think it's more of a wireless+phone issue than a pfSense issue.

edpbettinelli

@johnpoz said in Problems between iphone and dhcp?:

are you saying you can not ping an iphone by name when unbound is restarting - this would make sense.
Or are you saying iphone can not ping pfsense IP on the iphone vlan? By IP? By name?
If unbound is restarting - then yeah you could have issues with resolving anything by name.. But that should not effect ping by IP..
Registering dhcp leases in unbound has been problematic for quite some time, because any time a lease is redone or issued it forces a restart of unbound, etc.

the effect is that all apps are blocked, with an app on iphone i verified that ping using ip. other iphone or voip phones on the same vlan respond to ping, while if in that minute I try to ping pfsense no response.

johnpoz

@edpbettinelli ok I just started a ping to my iphone IP 192.168.2.198

I restarted dhcp, I even did a manual reload of all the firewall rules..

Not 1 ping dropped.

Ping statistics for 192.168.2.198:
    Packets: Sent = 124, Received = 124, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 2ms, Maximum = 322ms, Average = 73ms
Control-C

from a box on another vlan to the wifi vlan the iphone is on...

edpbettinelli

@johnpoz sorry I didn't understand, did you ping from iphone to your gateway or from pfsense to iphone?
I see the problem from iphone to pfsense

Sorry for my english

stephenw10

So during the failure you are still able to ping pfSense from other devices?

If pfSense itself stops responding then it does sounds like know pf reload issue:
https://redmine.pfsense.org/issues/12827

Steve

edpbettinelli

@stephenw10 I confirm that with all other devices except iphone pfsense does not lose a ping. it seems like some strange management of wifi by apple

johnpoz

@edpbettinelli ok on my iphone.. Pinging pfsense IP on that vlan.

Restart unbound, reload firewall filters, restarted dhcp, etc..

Not a ping lost

PNG image.png

stephenw10

Mmm, there's really no reason the iphone should react at all to dhcpd restarting.

Can we see your test results so we know exactly what you're seeing?

Steve

johnpoz

@stephenw10 said in Problems between iphone and dhcp?:

there's really no reason the iphone should react at all to dhcpd restarting.

exactly - the only thing I could see having any possible effect at all is a reload of the firewall rules.. if that got hung up then maybe ok, but states are not flushed on a reload, I don't think that is a default setting - mine don't flush the states, etc..

So if you started a ping just as the firewall rules were reloading I could see maybe an issue?

edpbettinelli

@johnpoz Last night I tried from home in vpn to reload the rules I am attaching the ping screen to pfsense.

There was an iphone connected which never lost the ping during all my tests (the ping, however, was from my pc in vpn to the iphone).
This morning I tried to activate a dhcp on a test vlan and my iphone crashed as usual,
while the rest of the devices had no problems (same behavior of the attached snap).
I forgot the iPhones are managed by a mdm in the cloud.
Other tests I will be able to do only when the company is stopped.
Do you have tests to recommend to me to get more data to find the cause of the problem?
Thank you very much for your support, I will keep you updated on the developments.
Luca Bottini