[c-nsp] strange ARP issue, 40K worth of entries

[Jared Mauch]

Turn off proxy arp on the interface. Make sure routes are pointed at an ip or ip+interface and not just the interface for default first. 

Jared Mauch

On Oct 13, 2011, at 3:27 PM, John Brown <john at citylinkfiber.com> wrote:

> So I do a sh arp on a client router and it has 40K worth of entries.
> The entries are public IP's all pointing upstream.
> 
> I've never seen anything like this.  Any thoughts ??  Mucho Thanks
> 
> Interface on service provider side.
> 
> interface Vlan8
> description v008.fttx.CUSTOMER
> ip address 216.XXX.YYY.249 255.255.255.252
> no ip redirects
> end
> 
> 
> Stuff on the Customer side.
> 
> 
> r0ca#sh run int gi0/0.10
> Building configuration...
> 
> Current configuration : 185 bytes
> !
> interface GigabitEthernet0/0.10
> description v010-outside-link
> encapsulation dot1Q 10
> ip address 216.XXX.YYY.250 255.255.255.252
> no ip unreachables
> end
> 
> 
> r0ca#sh arp sum
> Total number of entries in the ARP table: 40750.
> Total number of Dynamic ARP entries: 40729.
> Total number of Incomplete ARP entries: 17.
> Total number of Interface ARP entries: 4.
> Total number of Static ARP entries: 0.
> Total number of Alias ARP entries: 0.
> Total number of Simple Application ARP entries: 0.
> Total number of Application Alias ARP entries: 0.
> Total number of Application Timer ARP entries: 0.
> 
> Interface              Entry Count
> GigabitEthernet0/1.101          21
> GigabitEthernet0/1.20           34
> GigabitEthernet0/1.2             2
> GigabitEthernet0/0.10        40693
> 
> 
> Protocol  Address          Age (min)  Hardware Addr   Type   Interface
> Internet  1.1.1.1                 4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.22.17.130             5   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.22.72.41              5   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.22.233.14             5   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.23.6.132              4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.23.15.138             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.23.88.51              4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.23.158.76             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.23.168.27             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.23.168.186            5   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.23.172.153            4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.23.176.35             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.23.199.245            5   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.36.21.104             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.38.157.234            4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.38.187.174            4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.40.190.118            4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.40.217.64             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.44.87.158             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.53.8.24               4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.53.95.222             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.53.166.6              4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.54.23.243             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.55.61.97              4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.55.92.139             4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> Internet  1.55.168.151            4   00d0.02fc.d800  ARPA   GigabitEthernet0/0.10
> 
> 
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