| Attachment | Size |
|---|---|
 cleanedconfig.txt | 5.78 KB |
This is a temporary solution until a wireless plant is put into place next year...
I have an apartment complex that we are using wireless Arris modems that have been setup so that wireless cpe connecting to the modem has to get an IP from the dhcp server(cnr) and not from the internal dhcp server. There are modems with wireless in each apartment that are open and no security, yeah I know. A computer sometimes won't connect to any of them until I go in and delete its entry in the arp table on the cmts. Once I do that it can connect to any wireless on the network without an issue. Some devices don't even show up in arp at all but they can see the AP and just hang there trying to get an IP. If they connect to another AP sometimes they can come back to the original and connect but most times they don't then I have to delete them in the arp table. But I can connect wired to anything and it works fine from modem to modem.
I attached a config and slimmed it down a little by removing some of the cable interfaces and identifiable information.
3w5d: %UBR7200-3-BADARPREQUEST: Interface Cable3/1, ARP request from invalid source on Cable4/0. IP=172.16.163.159, MAC=a8fa.d813.6325,
Expected SID=17, Actual SID=26
3w5d: %UBR7200-3-BADARPREQUEST: Interface Cable3/1, ARP request from invalid source on Cable4/0. IP=172.16.163.159, MAC=a8fa.d813.6325,
Expected SID=17, Actual SID=26
SLOT 3/0: 3w5d: %UBR7200-6-CMMOVED: Cable modem 0015.d006.bf8b has been moved from interface Cable3/1 to interface Cable3/0.
SLOT 3/0: 3w5d: %UBR7200-6-CMMOVED: Cable modem 0015.d006.ad4b has been moved from interface Cable3/1 to interface Cable3/0.
3w5d: %UBR7200-3-BADARPREQUEST: Interface Cable4/0, ARP request from invalid source on Cable3/1. IP=172.16.163.166, MAC=2cb4.3a6f.8d9b,
Expected SID=26, Actual SID=2919
3w5d: %UBR7200-3-BADARPREQUEST: Interface Cable4/0, ARP request from invalid source on Cable3/1. IP=172.16.163.166, MAC=2cb4.3a6f.8d9b,
Expected SID=26, Actual SID=2919
3w5d: %UBR7200-3-BADARPREQUEST: Interface Cable4/0, ARP request from invalid source on Cable3/1. IP=172.16.163.166, MAC=2cb4.3a6f.8d9b,
Expected SID=26, Actual SID=2919
3w5d: %UBR7200-6-CMMOVED: Cable modem 001d.cec7.00b5 has been moved from interface Cable5/1 to interface Cable4/1.
3w5d: %UBR7200-3-BADARPREQUEST: Interface Cable3/0, ARP request from invalid source on Cable4/0. IP=172.16.164.204, MAC=1ce6.2b12.d3ef,
Expected SID=53, Actual SID=41
CMTS-3#show cable modem 0015.d006.c3f3 cpe
IP address MAC address
172.16.146.143 0023.1255.66f0 <------------ This one could connect but not go anywhere or connect to another AP until I cleared it
172.16.147.34 1834.519e.538c
172.16.131.86 001e.c29d.2583
172.16.132.240 4cb1.9917.a763
CMTS-3#clear ip arp 172.16.146.143
CMTS-4#show cable modem 0022.fb15.2d96 cpe
IP address MAC address
172.16.151.96 5426.96cd.0415
172.16.151.33 18af.6155.65b1
172.16.161.73 001d.d825.3b40
0.0.0.0 9c04.eba7.8fa6
0.0.0.0 8c58.77b7.b883
0.0.0.0 8429.99a8.8d2b
0.0.0.0 4030.0459.7dd4
0.0.0.0 e0c9.7a3d.d45d
I think you are in trouble here
The CMTS will typically block a CPE from jumping quickly between cable modems
If you do move a device quickly you may need to "clear cable host xxx" on the original modem to fix it
If you have multiple access points each connected to their own modem, the CPE might jumping around between access points depending on signal strength
Better design might be to have a mesh of access points that connect back to a single cable modem
mbowe
Thanks for the suggestion. But they don't really want to do anything but fix it at the cmts.
My thought was this solution. Which I think would not let the cmts forward arp requests through the whole chassis. The other option was maybe moving from a bundle to a per interface config?
config t
!
interface Loopback0
no ip proxy-arp
!
interface GigabitEthernet0/1
no ip proxy-arp
!
interface GigabitEthernet0/2
no ip proxy-arp
!
interface Bundle1
cable arp filter request-send 4 2
cable arp filter reply-accept 4 2
no cable arp
end
write mem
clear arp-cache
clear counters