Two Cisco Routers in one class-c network

Hello,
i have two cisco routers, which are connected to one switch. On this switch, there are several servers connected as well.
When i connected the second cisco router, i got messages on the first router, that there is an ip address conflict. After a few minutes it seems as if the vpn tunnel on the first router breaks down because of this conflict. I'm not sure about this, but when i disconnected the second router again, the vpn tunnel could be established again. The vpn tunnel goes to another router via WAN and ends in the local class-c network, where both routers are in.
Router1
LAN 192.168.105.254 (255.255.255.0)
WAN 212.xxx.xxx.xxx
||
||
Cisco Switch
||
||
Router2
LAN IP 192.168.105.253 (255.255.255.0)
WAN IP 217.xxx.xxx.xxx
Router1
int fa 0/1
ip address 192.168.105.254 255.255.255.0
Router2
int fa 0/1
ip address 192.168.105.253 255.255.255.0
Could the /24 mask on the interfaces cause the conflicts?
From the servers, none has the ip 192.168.105.253 or 192.168.105.254 and if i disconnect Router2, the IP 192.168.105.253 is not reachable from any system on the switch.
So how does this ip address conflict occur?

hello,
can you check the router 1 log. with error message you should have a mac address
May 10 05:32:20.489: %IP-4-DUPADDR: Duplicate address 10.10.10.1 on GigabitEthernet0/1.1, sourced by 0003.oc12.a2c3
This should help you to identify host already with 192.168.105.253.
Before connecting Router 2, from Router 1 ping 192.168.105.253 and do a sh arp ?
HTH,
regards,
cisand

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