2631 configures NAT，adopting the address pool and ACL association. It is normal for the private network to access Internet，but the Internet cannot communicate with Internet address of 2631, and 2631 cannot communicate with other addresses of Internet.
Amend ACL，change the matching network segment in rule to the private network address range，Such as：
only allow the network segment of 192.168.0.0/24 to be switched by NAT，
rule permit source 192.168.0.0 0.0.0.255
after amending, 2631 can communicate with the other addresses of Internet.
The ACL list associating with NAT address pool is：rule permit source any，it means all the IP packet source addresses from the Interface are switched to the addresses in NAT address pool by NAT, including icmp echo and reply packets，so the addresses in the Ping packets echo and reply connecting with 2631 Internet interface are not consistent（one is the interface address，another is the address in NAT address pool），so it cannot be communicated.