Unable tu reach public ip

Question

Hello 
 i have two sites with two public static IPs IP1 : a.b.c.2/22 and it's getway is a.b.c.1 the second site have the following ip : a.b.c.6/22 and it's getway is a.b.c.5 
 my probleme is when i try to reach or ping a site from another it works fine but when i put sophos XG firwall and the wan port take the public adress sites become unreachable for example from firewall in site one i can reach the ip1 getway but not the second site and when i try to tracert it the request does not reach even the gateway router 
 
 Can anyone help me with this Problem ?

Vishal_R · Answer

Hi cherif metarfi I believe rfcat_vk is correct. Here your both the ISP IPs having /22 subnet which is putting them in the same network segment and while you are assigning/configuring this on XG as a WAN over 2 different physical port, it will create a ARP or network conflict issue. 
 As a best practice it is not advisable to configure same network over two different physical Interface of same XG. In short to reach a.b.c.5 firewall will get the ARP or network connectivity via 2 different physical WAN Interfaces and that may create a problem with your gateway status ( Up/Down) or in some cases gateway will not be able to make status up at all as it will forward ARP via 1st Interface due to same network availability.