arp-scan config not working !

[ErfanDL]

Hi. today I update the Pi.Alert to version 3.0 and add the SCAN_SUBNETS = '10.5.50.0/24 10.5.51.0/24' parameter to pialert.conf, but the 10.5.50.0/24 devices doesn't show up in PiAlert web UI. what's wrong ?

thanks.

[pucherot]

Hi Can you execute this commands?

ifconfig

ip route

sudo arp-scan 10.5.50.0/24 10.5.51.0/24

[ErfanDL]

Thanks for reply. ip route:

default via 10.5.51.1 dev eth0 src 10.5.51.5 metric 202
10.5.51.0/24 dev eth0 proto dhcp scope link src 10.5.51.5 metric 202

arp-scan:

Interface: eth0, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.9.5 with 512 hosts (https://github.com/royhills/arp-scan)
10.5.51.1              Routerboard.com
10.5.51.2              ASUSTek COMPUTER INC.
10.5.51.3              Routerboard.com

4 packets received by filter, 0 packets dropped by kernel
Ending arp-scan 1.9.5: 512 hosts scanned in 5.474 seconds (93.53 hosts/sec). 3 responded

[pucherot]

10.5.50.0 segment is in the same interface eth0?

please, execute the command: ifconfig

[ErfanDL]

10.5.50.0 segment is in the same interface eth0?

please, execute the command: ifconfig

No it's not in the same interface eth0 it's routed by mikrotik router and I can ping the 10.5.50.0 subnet from 10.5.51.0 network.

here the ifconfig:

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.5.51.5  netmask 255.255.255.0  broadcast 10.5.51.255
        inet6 fe80::fc7e:28a4:65ae:26c0  prefixlen 64  scopeid 0x20<link>
        ether b8:27:eb:86:dc:6c  txqueuelen 1000  (Ethernet)
        RX packets 123109  bytes 26801684 (25.5 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 144045  bytes 19654929 (18.7 MiB)
        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 293666  bytes 20864852 (19.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 293666  bytes 20864852 (19.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether b8:27:eb:d3:89:39  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[bignick8t3]

Arp is Layer 2 only so is not routable meaning it will stay within the subnet.

You would need another interface within your 10.5.50.0 network to be able to use arp.

[ErfanDL]

Arp is Layer 2 only so is not routable meaning it will stay within the subnet.

You would need another interface within your 10.5.50.0 network to be able to use arp.

OK thanks.