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Modem/Router Combo EPR2320r2

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Modem/Router Combo EPR2320r2

the hardware is ubr10k.
If modem is set as gateway it working fine.
But if its set as Router its failing somehow and i cant seem to find what causing the problem.
The DHCP server is successfully assigning ip to the router and i can see the router part and the modem part in "show ip arp" but i can not ping it.
I cant find whats the problem is it a DHCP problem or UBR10k Config problem
The Router is asking for option 122 without it still dhcp request is successful
OPTION: 55 ( 14) Parameter Request List 72 (WWW server)
1 (Subnet mask)
2 (Time offset)
3 (Routers)
4 (Time server)
6 (DNS server)
7 (Log server)
12 (Host name)
15 (Domainname)
23 (Default IP TTL)
26 (Interface MTU)
54 (Server identifier)
51 (IP address leasetime)
122 (???)

can some one help

xsimio
modem as Gateway and modem as

modem as Gateway and modem as eRouter, means the same to me. Can you please be more specific?

Steps would be:
modem online (TLV 202 configured in CM config file)
eRouter doing a second DHCP process.
eRouter giving IP addresses to clients and NAT-ing the traffic.

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I fixed it

Sorry i fixed it. It was routing problem in the UBR.

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