Hi all .
We have a CCR1009 Router in our office and we put it as a pppoe-client for connecting to our ADSL modem . modem had been setup as bridge and everything goes fine .
But ,
Today we do change our internet service provider and they give us a new modem [ TD LTE modem ] . this modem don’t have bridge mode and its already in NAT mode .
So we do these for connecting to the new modem and internet .
1.We do disable the pppoe-client and connect the modem to router .
2.in IP addresses we add an ip address to the port that modem has been connected . [ IP is the same as modem ip range [ 192.168.10.0/24 is the range ]
3.we do disable the modem DHCP because we want Router act as a DHCP server .
4.then we add a route in ip route and put 0.0.0.0/0 to the modem ip .
5.already we create a NAT rule for masquared the 192.168.10.0/24 and internet access .
in this case router and clients has internet but when a client browse websites or even checking mail via outlock app , website load and after some minutes it says can not find server , or email account says can not reach smtp port but after another try it goes fine !
I search over the forum and I found that the mistake is maybe MTU issue , So I double check the MTU in my router and here are my findings :
there are mangle routes for MTU in my router that works fine with ADSL [ old modem ] and the out interface is pppoe-out1 . but in this new modem when I change the out interface to the eth that new modem has been connected , it shows that it is working and counter works but no luck .
So can someone help me on this issue ? is that MTU issue or not ? and is there any changes need for MTU when I don’t config the router as pppoe and only I do NAT for internet access ?
Thanks .