I recently upgraded from Jessie to Stretch, and now, while I get an ip address from my router (which is also showing up properly as my default gateway, at least according to "ip r"), and I can access the internet, I can't reach any of my local network directly (tried ping, traceroute, and nslookup).
Local machine's IP address is 192.168.1.115
source /etc/network/interfaces.d/* iface lo inet loopback iface eth0 inet manual auto xenbr0 iface xenbr0 inet dhcp bridge_ports eth0
If I ping 192.168.1.1 from my other machine, I get a response, but from this one, I get:
From 192.168.1.115 icmp_seq=1 Destination Host Unreachable
w3m can access google.com, but not 192.168.1.1 (which is accessible through firefox from my other machine).