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personal I have the following scenario
- 2 cmts cisco ubr7246vxr
- I provide private IP for most "CPE" and public ip to only the subscribers that need
- For private ip have a deafult route to the firewall and route-map for public ips to the link router
- I have 6 optical nodes in cmts 1 and I have to transfer 3 nodes for cmts 2
- My problem is this: is how to keep the public IPs of subscribers of these 3 nodes that need to transfer to the cmts 2? will I have to set up another public network ip in cmts 2 and change the ip of all subscribers who transfer to this cmts? attached a diagram of this situation.
thank you, Flavio.
Yes you have to split the 187.52.168.193/26 network in two:
- CMTS Network: 187.52.168.192/27
-CMTS Network: 187.52.168.224/27
Or transfer it to NAT/FIrewall platform and use SNAT/DNAT per client and IP.
divide the network would be my last chance because it generates many customer complaints. the above environment is a simplification I have many public ips I have to change and want to avoid.
someone has another solution?
divide the network would be my last chance because it generates many customer complaints. the above environment is a simplification I have many public ips I have to change and want to avoid.
someone has another solution?
the only other solution would be to move to a single larger cmts e.g. ubr10k
This is the reason why when we do static/public ips we do them at a /30 that way if we have to recombine the cmtses the /30's are portable between the cmtses, though the downside is it takes 4 ips to get one to a customer.
What linecards do you have in the 7246 ?
Eg if old 1x6, perhaps you could change to 2x8 and then not need a 2nd CMTS ?
Or if spare slots, dump some more cards in
Probably can buy these 2x8 cards for next to nothing these days
I suppose you know you can create bundle interfaces to share the IPs across multiple linecards within 1 chassis?
Dear Mbowe;
The situation was put simplified actually have 3 CMTS uBR7246vxr complete with plate mc28u and g1 and want to install 2 more full cmts.
The question is, there is the possibility of the same fixed IP CPE operate in any CMTS.
Thank you, Flavio.
No.
Hello Flavio and Mbowe,
There is a way and this way brings you a little bit more also closer to IPv6.
You should also push out the NAT from the CMTS and bring it to a NAT-Box.
- Assign a max. of 64 Private IPs to 1 Public, better you use 32.
- Use for your special customers a 1:1 NAT
With this you can spread your Public IPs over all the CMTS´s based on the available power of the NAT-Box.
you can solve this by adding /32 routes
let say you want to move 187.52.168.200 from cmts1 to cmts2
presently in the router you have
ip route 187.52.168.192 255.255.255.192 172.16.1.3
add
ip route 187.52.168.200 255.255.255.255 172.16.1.5
in the router
ip route 187.52.168.200 255.255.255.255 172.16.1.14
in the cmts1
int bundle1
ip address 187.52.168.193 secondary
ip route 187.52.168.194 255.255.255.255 172.16.1.14
ip route 187.52.168.195 255.255.255.255 172.16.1.14
ip route 187.52.168.196 255.255.255.255 172.16.1.14
ip route 187.52.168.197 255.255.255.255 172.16.1.14
ip route 187.52.168.198 255.255.255.255 172.16.1.14
ip route 187.52.168.199 255.255.255.255 172.16.1.14
ip route 187.52.168.201 255.255.255.255 172.16.1.14
ip route 187.52.168.202 255.255.255.255 172.16.1.14
...
ip route 187.52.168.254 255.255.255.255 172.16.1.14
in the cmts2
we do this all the time to avoid asking clients to change their ip when we have to move them between cmts