I have an Ubuntu 20.04.1 machine which consists of 2 adapters.
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enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.96 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::c87c:ea4b:8946:7b9a prefixlen 64 scopeid 0x20<link>
ether 08:00:27:bd:8b:9f txqueuelen 1000 (Ethernet)
RX packets 989 bytes 924978 (924.9 KB)
RX errors 0 dropped 37 overruns 0 frame 0
TX packets 373 bytes 49368 (49.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.0.69 netmask 255.255.255.0 broadcast 10.0.0.255
inet6 fe80::90e5:3014:8b6a:a8ee prefixlen 64 scopeid 0x20<link>
ether 08:00:27:d9:20:98 txqueuelen 1000 (Ethernet)
RX packets 38 bytes 3604 (3.6 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 103 bytes 9660 (9.6 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 1.1.1.2 netmask 255.255.255.252 broadcast 1.1.1.3
inet6 fe80::a00:27ff:fea6:1f86 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:a6:1f:86 txqueuelen 1000 (Ethernet)
RX packets 3 bytes 256 (256.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 19 bytes 1542 (1.5 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 8 bytes 400 (400.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 8 bytes 400 (400.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
The issue is that when I use the Bridged adapter on my Ubuntu machine, my Kali can't ping the IPv4 address of the Internal Network (DMZ) adapter anymore. However, I can access the website on 10.0.0.69 via my browser on Kali. In addition, I am able to ping the Ubuntu machine from a shell on my PFSENSE-HP router. To ensure that this isn't a firewall issue, I allowed all ICMP requests to flow from the External zone to the DMZ zone vice versa on the router. I also used iptables to make sure ICMP echo requests are not getting blocked on both the Ubuntu and Kali machines. What makes this even weirder is that, I can ping my Kali from my Ubuntu machine but not the other way round. The moment I remove the bridged adapter, the pings are able to work again. However, I really need the bridged adapter for gaining an internet connection on my Ubuntu machine. I just want to be able to get Internet connection but also be able to ping the network at the same time.
Any help would be appreciated! I'm literally going to get white hairs from this.
PS. The following are my adapter settings on my Ubuntu machine. (Please let me know if I'm not giving enough details in this post) Thanks in advance!