Conecting two Pi's over WiFi

[gattumarrudu]

I have a Pi3 running Raspbian and a Pi Zero W with Arch Linux. Both are set up for WiFi access (and the Pi3 has an ethernet address configured too).

I can SSH into both devices from an external laptop in the same subnet, but the Pi's cannot see (ping) each other. Can anybody advise please?

The Pi3 configuration:

$this->bbcode_second_pass_code('', '$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether b8:27:eb:67:32:f4 brd ff:ff:ff:ff:ff:ff
inet 192.168.86.30/24 brd 192.168.86.255 scope global noprefixroute eth0
valid_lft forever preferred_lft forever
inet6 fe80::b215:a6cc:6aae:f0ea/64 scope link
valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether b8:27:eb:32:67:a1 brd ff:ff:ff:ff:ff:ff
inet 192.168.84.29/24 brd 192.168.84.255 scope global noprefixroute wlan0
valid_lft forever preferred_lft forever
inet6 fe80::c34e:768d:6672:6b0f/64 scope link
valid_lft forever preferred_lft forever')

The Pi Zero:

$this->bbcode_second_pass_code('', '$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether b8:27:eb:a7:c4:5f brd ff:ff:ff:ff:ff:ff
inet 192.168.84.69/16 brd 192.168.255.255 scope global wlan0
valid_lft forever preferred_lft forever
inet6 fe80::ba27:ebff:fea7:c45f/64 scope link
valid_lft forever preferred_lft forever')

My WiFi is managed by a Google repeater.

Thanks in advance.