redonion
join:2008-08-25
| [HELP] Making Cisco 800 Config Changes
My office has a DSL connection through a Cisco 800. The only LAN connection on the Cisco is to a Linksys Wireless Router WRT54GX4. The other 3 LAN ports on the Cisco are not being used. Everything works fine at this point. The Cisco configs look like this:
no ip dhcp use vrf connected
ip dhcp excluded-address 10.0.0.3
ip dhcp excluded-address 10.0.0.1
!
ip dhcp pool CLIENT
network 10.0.0.0 255.255.255.0
default-router 10.0.0.1
dns-server xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
domain-name domain.net
lease 0 2
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface Vlan1
ip address 10.0.0.1 255.255.255.0
ip nat inside
ip virtual-reassembly
ip tcp adjust-mss 1452
no ip mroute-cache
hold-queue 100 out
!
ip route 0.0.0.0 0.0.0.0 Dialer1
The way I understand this is that all FastEthernet interfaces are on a single Vlan with ip address 10.0.0.1. I have no idea where or what 10.0.0.3 is. It's probably left over from something else and is not being used today.
I would like to make some changes.
We recently acquired a bunch of iMac's along with a 802.11n Airport/Time Machine. There is a lot a large file transfers within the office (from Mac to Mac), so it would make sense to run the Macs on their own network taking advantage of 802.11n.
In addition, we have also aquired a Ubuntu fileserver. This will only be used for Intranet purposes running Apache and Samba.
Here is what I would like to do on the Cisco:
fe0 Linksys
fe1 Airport (Macs)
fe2 Ubuntu
Remember, both the Linksys and Airport are routers too! So I will have 3 networks here when finished.
Here is how I invision things when finished:
Network 1
Linksys WAN
Airport WAN
Ubuntu
Network 2
Linksys - DHCP clients 192.168.1.0/24
Network 3
Airport - DHCP clients 192.168.2.0/24
Ubuntu - Cisco
Initially, I figured I would just connect the Airport and Ubuntu and everything would work. However, that is not the case. Both the LinkSys and Airport get their IP address via DHCP. And whichever device I plug in last, works, the other doesn't.
It makes no sense having Ubuntu, Linksys, and Airport run DHCP on their WAN interface. So what should I do?
no ip dhcp pool CLIENT
Then configure the clients with static addresses like this:
Ubuntu 10.0.0.2/24 with 10.0.0.1 default route
Linksys 10.0.0.3/24 with 10.0.0.1 default route
Airport 10.0.0.4/24 with 10.0.0.1 default route
Then on the Cisco box I would need to setup some static routes correct?
ip route 192.168.1.0 255.255.255.0 10.0.0.3
ip route 192.168.2.0 255.255.255.0 10.0.0.4
Any help would be appreciated. It's been a very long time since I've done this. |
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phantasm11b
Premium
join:2007-11-02
Cocoa, FL
| Why not run the Linksys and Airport in bridge mode, assign them both static ip's and have your 800 act as a dhcp server.
The network at my house is setup like this: Cisco 831 -> Linksys WAP -> Vonage Box
Everything connects via wireless to the network except 1 or 2 desktops which are hard wired. All devices have static ip's in the 192.168.1.x network except the WAN interface on the Cisco 831.
No connection issues, well minor issue with the Vonage device but that's a configuration problem.
--
"There are two American flags flying on the property I reside on. Anyone who tries to take them down will be rendered inoperative." -Lindy |
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Bink
join:2006-05-14
Denver, CO
 ·Qwest.net
| I second this. It sounds like your network is small enough that you don’t need the mess of three subnets.
You can still have the Mac clients use 802.11n, but if the Linksys is doing 802.11g you might want to consider running the 802.11n at 5GHz only—as this might improve performance since both APs won’t be competing for spectrum. |
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redonion
join:2008-08-25
| reply to redonion
I'll check my Airport and Linksys and see if there is an option to set them up for bridge mode. Then, like you both said, I could just serve up IP address to everyone via a DHCP pool within the Cisco box. I'll check on the bridge mode tomorrow when I'm at work.
As a side note to Blink:
You are correct. The Linksys is 802.11g ONLY. I did tests running the Mac clients at 802.11n and 802.11n 5GHs only. File transfer times increased by about 80% using 5GHz only. Good call! |
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Bink
join:2006-05-14
Denver, CO
·Qwest.net
| With regard to making those APs work only like APs—not routers—all you should really have to do is plug an Ethernet cable from an Ethernet port on the Cisco to an Ethernet port on the Linksys/Airport. Leave the Internet/WAN ports on the APs empty. Then shut off DHCP on the Linksys and Airport—and that should largely do the trick.
As for the 802.11n, glad to hear it rocks now  . |
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redonion
join:2008-08-25
| reply to redonion
Blink,
Cool! Sounds to easy. I'll disconnect the WAN ports in the morning and set the network up as you described. Should be a no brainer LOL
4 Issues that may arise:
1. By bypassing the WAN port, the APs will no longer have an IP address, so I am assuming that I will loose ALL access to both these devices. And not have any means to configure or access these from this point forward.
2. On the Mac Time Capsule, there is a Printer attached via USB. I'm wondering how that works. Do people print to it via an IP address, or some type of multicast or broadcast address. If I need an IP address to print to it, I may not be able to bypass the WAN port on the Time Capsule.
3. I am assuming that this configuration gives out +/- 252 IP addresses via DHCP. And that 10.0.0.1 and 10.0.0.3 are reserved and will not be issued via DHCP.
!
ip dhcp pool CLIENT
network 10.0.0.0 255.255.255.0
!
ip dhcp excluded-address 10.0.0.3
ip dhcp excluded-address 10.0.0.1
!
4. 10.0.0.1/24 is the address for VLAN1, and 10.0.0.3/24 is not being used (can't find it in the configs and cant ping it from anywhere). So I should be able to give the Ubuntu box 10.0.0.3/24 and plug it straight into the Cisco box right?
My final configuration should look like this:
VLAN1 10.0.0.1/24
fe0 Linksys DHCP 10.0.0.0/24 network
fe1 Time Capsule DHCP 10.0.0.0/24 network
fe2 Ubuntu 10.0.0.3/24
fe3 unused
And all my Macs, Windoze, Linux, and Printers will now be in the same 10.0.0.0/24 network and broadcast domain. So I shouldn't have any issues with Samba, or Macs finding their printer.
I love theory. But tomorrow, I'll put this all into practice and see how it goes. |
|
Bink
join:2006-05-14
Denver, CO
·Qwest.net
| said by redonion  :1. By bypassing the WAN port, the APs will no longer have an IP address, so I am assuming that I will loose ALL access to both these devices. And not have any means to configure or access these from this point forward. No. Like phantasm11b said, configure these with static IPs in the 10.0.0.0/24 range prior—and exclude those IPs from the DHCP config.
said by redonion :2. On the Mac Time Capsule, there is a Printer attached via USB. I'm wondering how that works. Do people print to it via an IP address, or some type of multicast or broadcast address. If I need an IP address to print to it, I may not be able to bypass the WAN port on the Time Capsule. I think Macs do some multicast magic to discover it, but I expect it’ll still need an IP—which you’ll configure as per above and I don’t think the WAN port will affect anything here.
said by redonion :3. I am assuming that this configuration gives out +/- 252 IP addresses via DHCP. And that 10.0.0.1 and 10.0.0.3 are reserved and will not be issued via DHCP. Yep.
said by redonion :4. 10.0.0.1/24 is the address for VLAN1, and 10.0.0.3/24 is not being used (can't find it in the configs and cant ping it from anywhere). So I should be able to give the Ubuntu box 10.0.0.3/24 and plug it straight into the Cisco box right? If 10.0.0.3 is a device that’s firewalled or currently offline, you might have an issue. Outside of this, should be fine.
said by redonion :My final configuration should look like this: VLAN1 10.0.0.1/24 fe0 Linksys DHCP 10.0.0.0/24 network fe1 Time Capsule DHCP 10.0.0.0/24 network fe2 Ubuntu 10.0.0.3/24 fe3 unused And all my Macs, Windoze, Linux, and Printers will now be in the same 10.0.0.0/24 network and broadcast domain. So I shouldn't have any issues with Samba, or Macs finding their printer. I love theory. But tomorrow, I'll put this all into practice and see how it goes. Looks more normal now . Good luck. |
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redonion
join:2008-08-25 | reply to redonion
Thanks for your help guys! I kind of felt stupid asking the question, but would have felt more stupid not asking and having a broken network  |
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Bink
join:2006-05-14
Denver, CO | I wouldn’t call it a broken network , but it wouldn’t be a network I’d want. |
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