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

[Kasper Adel]

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800ef7b2.shtml

On Thu, Oct 13, 2011 at 10:06 PM, Jared Mauch <jared at puck.nether.net> wrote:

> 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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