Statically Routed T1 Leased Line



Information supplied by ViaNet
ViaNet WAN IP address:209.81.51.1
Customer WAN IP address:209.81.51.2
WAN IP netmask:255.255.255.252
LAN IP allocation:209.81.100.0/24
LAN IP netmask:255.255.255.0


Router Config
! Allow use of zero'th subnet
ip subnet-zero
! Disable obsolete IP class assumptions
ip classless

interface serial 0/0
  desc T1 to ViaNet PacBell Circuit 77HCGF924831-001.pt
  ip address 209.81.51.2 255.255.255.252
  no shutdown

interface fastether  0/0
  desc Local ethernet LAN
  ip address 209.81.100.1 255.255.255.0
  no ip directed-broadcast
  no shutdown

! default route
ip route 0.0.0.0 0.0.0.0 serial 0/0

CSU/DSU Config
Your CSU/DSU should be set for the following options:

  • B8ZS/ESF line coding
  • Clock Source: line
  • Starting channel: 1
  • Number of channels: 24
  • Channel sequence: contiguous

    Note: Most brands of CSU/DSU's that we've used (Kentrox/Digital Link/ADTRAN) are correctly configured for T1 use when reset to factory defaults.