multiple ip via dhcp

[Kendrick-LUG]

Gerald Combs wrote:

>Kendrick-LUG wrote:
>  
>
>>I am wondering if there is a way to set up the lo to have a mac addr and
>>use it to pick up the other 3 ip addreses for my boxes.
>>I am wanting to get 3 to 4 ip's being used via dhcp since dhclient wont
>>allow multiple ip's via one card.
>>I want to use the mac's of the internal network and set it up so that i
>>could have services on eth1 mac a  server   do most serving of stuff but
>>some private stuf be on lo(orth eth1:1) 2 and 3 mac b and c wich
>>corospond with the 2 work stations.  yet keep the 2 ws on private lan.
>>    
>>
>
>As far as I know, you can't assign a MAC address to a loopback interface
>(at least not easily).  MAC (Media Access Control) addresses are used to
>identify pieces of hardware on a network, and they can only be applied
>to a few specific media types.  You can apply MAC addresses to Ethernet,
>802.11, Token Ring, and FDDI interfaces, but not PPP, SLIP, or loopbacks.
>
>DHCP uses a field called the "client identifier" to hold a unique key
>for each client.  Normally this contains the client's MAC address, but
>it can be any string.  You can grab multiple DHCP leases using the same
>MAC address as long as you use a unique client identifier for each lease.
>
>You say you're running "dhclient", so I assume you mean the ISC DHCP
>client.  Are you sure it won't grab multiple addresses?  According to
>the dhclient.conf man page, you should be able to use something like:
>
>    interface "eth0:1" {
>        send dhcp-client-identifier "myhost-eth0:1";
>    }
>
>    interface "eth0:2" {
>        send dhcp-client-identifier "myhost-eth0:2";
>    }
>
>My machine runs "dhcpcd" (Gentoo's default) instead of "dhclient", so I
>can't test this here.  Dhclient let me do the following, however:
>
>    mkdir /tmp/eth0:1 /tmp/eth0:2
>    dhcpcd -I myhost-eth0:1 -L /tmp/eth0:1 eth0:1
>    dhcpcd -I myhost-eth0:2 -L /tmp/eth0:2 eth0:2
>
>"-I" specifies the client identifier.  "-L" specifies a client config
>directory, which must be unique for each lease.  I ended up with the
>following:
>
>eth0:1    Link encap:Ethernet  HWaddr 00:E0:18:E5:38:88
>          inet addr:192.168.0.87 Bcast:192.168.0.255 Mask:255.255.255.0
>          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:7526 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:7709 errors:0 dropped:0 overruns:0 carrier:7709
>          collisions:0 txqueuelen:100
>          RX bytes:6108371 (5.8 Mb)  TX bytes:1137653 (1.0 Mb)
>          Interrupt:10 Memory:ed800000-ed801080
>
>eth0:2    Link encap:Ethernet  HWaddr 00:E0:18:E5:38:88
>          inet addr:192.168.0.88 Bcast:192.168.0.255 Mask:255.255.255.0
>          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:7526 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:7709 errors:0 dropped:0 overruns:0 carrier:7709
>          collisions:0 txqueuelen:100
>          RX bytes:6108371 (5.8 Mb)  TX bytes:1137653 (1.0 Mb)
>          Interrupt:10 Memory:ed800000-ed801080
>
>
>  
>
ok cool  i appriciate that.  apparently i misunderstood that part.   to 
jonathan.  rr costs 50$ for 2 static plus you have to purchase the 
business class which is a attitional 80$ a mo on top of that. 

believe me im tempted to move to Lawrence just to get a decent deal on 
Internet