Site to Site T1 between a 3745 and 2650xm

[bchyka]

Hello,

i just had a site to site t1 installed between 2 sites here. we will call them site A and Site B. Site A has a 3745 router that handles a ds3 also and site B has a 2650xm. here is the ip addressing we will use:

SITE B: LAN 172.18.7.254/24 with a default route of 172.18.7.254 WAN 172.18.63.244/30 with B at 172.18.63.246 and SITE A at

172.18.63.245

does this look right for the serial interfaces at both locations:

SITE A 3745:

Interface serial 0/0

>>service-module t1 clock source line

>>service-module t1 timeslots 1-24 speed 64

>>service-module t1 framing esf

>>service-module t1 linecode b8zs

>>ip address 172.18.63.245 255.255.255.252

>>encapsulation ppp

>>no shut

SITE B 2650XM:

Interface serial 0/0

>>service-module t1 clock source internal

>>service-module t1 timeslots 1-24 speed 64

>>service-module t1 framing esf

>>service-module t1 linecode b8zs

>>ip address 172.18.63.246 255.255.255.252

>>encapsulation ppp

>>no shut

at site b we only have a 3650 for our core etc. i will plug fastethernet 0/0 into the 3560. the lan addressing is 172.18.7.0/24. i will run dhcp from the 3560. do i need any nat statements etc on the 3560/ im a little confused here.

also what would you recommend for ips on the fastethernet 0/0 of each router.

i really appreciate the help!

Bob C.

[Georg Pauwen]

Hello Bob,

the configuration for the T1's looks fine.

As for the LAN addressing: it is usually good practice to use either the first or the last IP address of the LAN address space for the interface address, so in your case, that would be either 172.18.7.1 or 172.18.7.254, as you suggested; the same for the LAN IP address space you use on the other side.

As for NAT: you do not need that if you just require connectivity between your sites, NAT would only be required if e.g. you wanted your local addresses to access the Internet...

HTH,

GP

[bchyka]

thanks for the reply. now it makes sense. at site b i want to access the internet. i was thinking of doing the natting on the 3560 switch there. what commands would i be looking at?

thanks again.