I can't connect to all my peers

jabe

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9
Hello
I've got problem from time when I changed my speed connection from my ISP. I've got new router from my ISP Cisco EPC 3925 and I can't connect to all my peers now. I can connect about to half only. I'm sure they are online because sometimes all working good, they see me online still I asked.
My clients can connect to me without problems, my TCP port is open of course.
I switched this Cisco in bridge mode, I connected my own router to it but still the same. I tried new image, other versions CCcam, DMZ mode in router but no results.
Solution please? I guess it's NAT problem but I need help. All worked fine earlier.
 
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