Hello, I recently purchased a 2901, I used to run an 1811. I'm trying to figure out if the reason I can't seem to get the ARP configuration working correctly.
I register to my Charter Fiber WAN using a static address 24.XXX.XXX.XXX. I have a static pool (68.XXX.XXX.100 - 68.XXX.XXX.105) assigned by Charter, used for servers. On my 1811 anyone attempting to reach my static pool has no issues. If I were to browse http://www.whatsmyip.org on this router, depending on what server i'm on, I will see an address of 68.XXX.XXX.XXX. This is what I expect to happen.
However, on my 2901 this fails. Internally the 68.XXX.XXX.XXX network works perfectly, I can echo and load any servers, however on the WAN side this network doesn't exist, and any attempt to use a 68 address server fails. If I were to browse http://www.whatsmyip.org, no matter what server i'm on, I will see an address of 24.XXX.XXX.XXX. Is this just a difference in models? It would seem by default ARP is setup on the 2901.
Cisco 2901 configuration
Building configuration...
Current configuration : 2350 bytes
!
! Last configuration change at 08:36:19 UTC Mon Oct 6 2014
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Cisco2901
!
boot-start-marker
boot-end-marker
!
!
enable secret 5 supersecretpassword
enable password 7 supersecretpassword
!
no aaa new-model
!
ip cef
!
!
!
ip dhcp excluded-address 68.XXX.XXX.100
!
ip dhcp pool DHCP_Pool
network 68.XXX.XXX.099 255.255.255.248
default-router 68.XXX.XXX.100
dns-server 8.8.8.8 8.8.4.4
class DHCP_Class
address range 68.XXX.XXX.100 68.XXX.XXX.105
!
!
ip dhcp class DHCP_Class
!
!
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
license udi pid CISCO2921/K9 sn FTX1828AKAY
!
!
!
redundancy
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
ip address 24.XXX.XXX.XXX 255.255.255.252
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
shutdown
duplex auto
speed auto
!
interface GigabitEthernet0/1/0
no ip address
!
interface GigabitEthernet0/1/1
no ip address
!
interface GigabitEthernet0/1/2
no ip address
!
interface GigabitEthernet0/1/3
no ip address
!
interface GigabitEthernet0/1/4
no ip address
!
interface GigabitEthernet0/1/5
no ip address
!
interface GigabitEthernet0/1/6
no ip address
!
interface GigabitEthernet0/1/7
no ip address
!
interface Vlan1
ip address 68.XXX.XXX.100 255.255.255.248
ip nat inside
ip virtual-reassembly in
!
router rip
network 68.0.0.0
!
ip default-gateway 68.XXX.XXX.100
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip nat inside source list InternetAccessList interface GigabitEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
!
ip access-list standard InternetAccessList
permit 68.XXX.XXX.0 0.0.0.255
!
!
!
snmp-server community WWM_Cisco2901 RO
snmp-server enable traps entity-sensor threshold
!
control-plane
!
!
!
line con 0
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
password 7 supersecretpassword
login
transport input all
!
scheduler allocate 20000 1000
!
end
Show arp
Internet 24.XXX.XXX.XXX - f8c2.8869.fbe0 ARPA GigabitEthernet0/0
Internet 68.XXX.XXX.100 - f8c2.8869.fbe3 ARPA Vlan1
