i have been trouble shooting an on going issue with what i believe is an ARP table conflict
basically we have 2 CRM Production servers that are load balanced and this load balancer ip is 192.168.1.189 and the MAC lets just say is 12345. there are 2 public switches in HA (vpn gateway too) that then point to 2 cisco FTDs in HA which then points to the DMZ and internal network
when a user goes home. connects to their home network they often get a 192.168.1.189 IP address and it just so happens that 2 users have NICs tht are also saying their MAC is 12345.
this is where im lost.
when these users come back into the office. the ARP table on our cisco FTD is getting confused and routing all external traffic/ VPN traffic to that client laptop which doesnt respond and everyone gets 504. anyone on the network or DMS is able to use CRM fine. i amguesinig because it doesnt route through the FTDs which are jacked up some how.
yesterday we reset the ARP table time out / refresh and it resolved the issue. get ran ipconfig /all and verified that these two users laptops have the same IP and MAC as the CRM loadbalancer
what can i do here? not a networking guy
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