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In VPN IPSec Router Interface going down

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Hi all,


I am new to this forum. i am having trouble with one of my test environment done in GNS3. Here is the situation


I am configuring site to site vpn. SiteA -------R1-------(ISP)--------R2---------SiteB. From configuration point of view every this is completed. I can ping from SiteA to SiteB and vise-versa. But when i start ping at the same time from both site, after like 50 ping count, it stopped. then i found R1 and R2 to ISP interface is down, after do shut and not shut every thing become normal again. If i do ping only from SiteA to SiteB no problem occur.


I am getting any help from google. Where i am making mistake any idea ?



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