topic Re: APs blocks LPR protocol? in Aerohive Migrated Content

APs blocks LPR protocol?

michal_dolejsi — Wed, 18 Mar 2020 23:41:23 GMT

Hello community,

We just replaced our WiFi solution with Extreme. Any idea, why APs blocks TCP-515 (LPR/LPD) protocol, used by our network printer?

If I am connected to old WiFi, it is working fine. I tried to do a packet capture on edge firewall and I can see that first LPR packet after TCP-handshake is blocked.

Any idea, what could be wrong? Thank you for suggestions.

Regards, Michal

Re: APs blocks LPR protocol?

samantha_lynn — Thu, 19 Mar 2020 20:25:12 GMT

Any traffic that is blocked should be specified in the IP firewall rules found in the user profile of the SSID. If you can let me know which HiveManager platform you're using, I can give you more specific instructions on where to check for rules that would block traffic.

This guide will walk you through how to determine which HiveManager you are using, for reference: https://thehivecommunity.aerohive.com/s/article/Which-HiveManager-Platform-am-I-using

Re: APs blocks LPR protocol?

michal_dolejsi — Thu, 19 Mar 2020 20:26:56 GMT

Hi Sam, we use ExtremeCloud IQ. IP firewall is disabled under User Profile.

Michal

Re: APs blocks LPR protocol?

samantha_lynn — Thu, 19 Mar 2020 21:45:57 GMT

Thank you for letting me know. Would you be able to send me the packet capture where you see the TCP traffic blocked? My direct email is communityhelp@aerohive.com.

Re: APs blocks LPR protocol?

michal_dolejsi — Thu, 19 Mar 2020 21:49:39 GMT

Hi Sam, I just sent you two pcap files.

Re: APs blocks LPR protocol?

michal_dolejsi — Tue, 24 Mar 2020 16:34:33 GMT

Sam, any idea what could be wrong?

Re: APs blocks LPR protocol?

samantha_lynn — Tue, 24 Mar 2020 20:10:43 GMT

Thank you for the packet captures and your patience while we looking in to them. You said originally that these packet captures were taken from the edge firewall, is that correct for these captures we're looking at here? If you can see the traffic on the edge firewall downstream from the APs then the APs wouldn't be blocking that traffic. I'm also seeing a reset request coming from 192.168.65.61, is that the printer in question? Could you also tell me if the printer is a wireless client and whether or not you have inter-station traffic enabled?

Re: APs blocks LPR protocol?

michal_dolejsi — Tue, 24 Mar 2020 20:50:24 GMT

Hi Sam, yes - these captures are from edge firewall. If you compare these two pcaps, packet number 4 from LPR_print1 is missing in the LPR_print2. I was connected to Extreme AP during the LPR_print2 pcap. And that is why station .65.51 resets this TCP session. Because of timeout.

Printer is connected over wire. It is not wireless client.