Hello,
I recently upgraded from Astaro ASG 8 to Sophos UTM 9, hoping that my problem will solve itself, but unfortunately it didn't...
I'm using the software appliance/personal edition on a classic PC, that has 4 interfaces (internet network, wifi network, wired network, VM network).
eth0 is assigned to wifi network
eth1 is assigned to wired network
eth2 is assigned to internet network
eth3 is assigned to VM network
My DNS servers are on 2 virtual machines, located behind eth3.
My PC, my wife's Mac Mini, and our media center are wired, located behind eth1.
(I placed a rule allowing DNS requests from these 3 PCs to the DNS servers)
Here is the problem :
Every time I power on any of the 3 machines located behind eth1, I can't "get access to the internet" for at least 1 minute or 2.
When I dig a little bit, I notice that I don't have DNS resolution within these 1-2 minutes I have to wait for (hence the lack of internet connectivity).
Actually, if I dig deeper, I can see that the ARP table (on every machine) is false : the wired network gateway interface's MAC address should be eth1's MAC address, but is actually eth0's MAC address!
At least for these 1-2 minutes... Once the MAC address has been corrected in the ARP table, everything goes back to normal.
(fig1.jpg : ARP table after boot up, then after waiting for a few minutes)
Of course, as long as the ARP table is false, the DNS request packets are not really properly routed through the UTM, and I get "default drop" messages in the firewall log.
(fig2.jpg : firewall log showing the wrong dstmac for a while, then the good one)
In a way, this is not a serious issue for the PC and the Mac Mini, but on the media center (Ubuntu-based XBMC), the ARP table can take 5 to 10 minutes to be refreshed.
(I'll let you imagine what happens when I'm not home and my wife can't watch her favorite shows on the media center at once after booting it up...)
Well, I suppose there is a slight problem with the ARP response packets the first time the UTM sees a machine on the wired network.
Is there something I have to set up to fix this issue?
Any help would be greatly appreciated!
Thanks a lot in advance!
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