nanog mailing list archives
Re: Apple devices spoofing default gateway?
From: Matt Freitag <mlfreita () mtu edu>
Date: Fri, 7 Jun 2019 15:59:26 -0400
For those of us with Aruba wireless, www boy, could you share some more info about your setup/code version/configuration/specific APs/controller model(s)/etc? Matt Freitag Network Engineer Michigan Tech IT Michigan Technological University We can help. mtu.edu/it (906) 487-1111 On Fri, Jun 7, 2019 at 3:06 PM Matt Hoppes < mattlists () rivervalleyinternet net> wrote:
Turn on client isolation on the access points?On Jun 7, 2019, at 3:00 PM, Hugo Slabbert <hugo () slabnet com> wrote:On Fri 2019-Jun-07 16:21:29 +1000, www boy <wwwboy () gmail com> wrote: I just joined nanog to allow me to respond to a thread that Simonposted inMarch. . (Not sure if this is how to respond) We have the exact same problem with Aruba Access points and withmultipleMacBooks and a iMac. Where the device will spoof the default gateway and the effect is thatvlanis not usable. I also have raised a case with Apple but so far no luck. What is the status of your issue? Any luck working out exactly what the cause is?We appeared to hit this with Cisco kit:https://www.cisco.com/c/en/us/support/docs/wireless/aironet-3800-series-access-points/214491-arp-responses-for-default-gateway-ip-add.htmlThey don't say *exactly* that the Apple devices are spoofing thegateway, but some behaviour in what they send out results in the proxy arp being performed by the APs to update the ARP entry for the gateway address to the clients':* This is not a malicious attack, but triggered by an interactionbetween the macOS device while in sleeping mode, and specific broadcast traffic generated by newer Android devices* AP-COS while in FlexConnect mode provides Proxy ARP (ARP caching)services by default. Due to their address learning design, they will modify table entries based on this traffic leading to default gateway ARP entry modificationThe fix was to disable ARP caching on the APs so they don't proxy ARPbut ARP replies pass directly between client devices.-- Hugo Slabbert | email, xmpp/jabber: hugo () slabnet com pgp key: B178313E | also on Signal
Current thread:
- Re: Apple devices spoofing default gateway? www boy (Jun 07)
- Re: Apple devices spoofing default gateway? Hugo Slabbert (Jun 07)
- Re: Apple devices spoofing default gateway? Matt Hoppes (Jun 07)
- Re: Apple devices spoofing default gateway? Owen DeLong (Jun 07)
- Re: Apple devices spoofing default gateway? Matt Freitag (Jun 07)
- Re: Apple devices spoofing default gateway? www boy (Jun 10)
- Re: Apple devices spoofing default gateway? Matt Hoppes (Jun 07)
- Re: Apple devices spoofing default gateway? Hugo Slabbert (Jun 07)
- Re: Apple devices spoofing default gateway? William Herrin (Jun 07)