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3

The good old arpwatch is still useful. Other than that, it might be a good idea to capture all network traffic for a few days and analyse it.


2

Maybe you should set your statics IP in the DHCP server or in the router (it could work as DHCP server). Check this tutorial. There are some considerations about setting a static IP in the client or in the DHCP server. Take a look to this.


1

In one machine you can only define your next gateway/hop. The second hop is configured as the gateway of the gateway, the third as the gateway of the gateway of the gateway and so on. The hops following to them must be set at those machines following. So you have to configure all 5 routers with the corresponding next hop.


1

I would suggest that this is probably due to something blocking ICMP packets of types 3 and 4 from O365 back to your client PC. These packet types report on packet fragmentation across network links. I would have expected these to be classed as "related" packets for a connection and so permitted as part of a TCP conversation, but perhaps not. If you have a ...


1

The solution is fairly easy, just replace auto to allow-hotplug. So I ended up with this: allow-hotplug lo iface lo inet loopback allow-hotplug wlan0 iface wlan0 inet static address 192.168.150.1 netmask 255.255.255.0 allow-hotplug eth1 iface eth1 inet manual up ifconfig $IFACE ...


1

The answers from jasonwryan and gelraen both point to dead links for the source code. The net-tools project is now hosted at sourceforge per this announcement.



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