Thanks for the advice Konstantin. To be honest the "crazy" option looks
very interesting, but perhaps for another day. I think I may have found
my solution. It occurred to me that I just needed to have a unique MAC
for my ISP's dhcp server, but not necessarily for the network proper.
In that case, I can simply pass a "unique" CLIENTID to dhcpcd when I
call it, as in the following test (-T) example:
# dhcpcd -T -I 00:GE:NT:00:RO:CK eth0:0
IPADDR='192.168.1.105'
NETMASK='255.255.255.0'
BROADCAST='192.168.1.255'
ROUTES=''
GATEWAYS='192.168.1.1'
DNSSERVERS='DNS server IPs are here'
DHCPSID='192.168.1.1'
LEASETIME='86400'
RENEWALTIME='0'
REBINDTIME='0'
INTERFACE='eth0:0'
CLASSID='dhcpcd 3.1.5'
CLIENTID='00:GE:NT:00:RO:CK
DHCPCHADDR='my:re:al:ma:ca:dd'
Now, of course, I didn't actually use 00:GE:NT:00:RO:CK as the CLIENTID,
but you get the point.
At this point the question becomes: Will I be able to use this with my
IP, not just my internal router? I hope so, I will test very soon.
Another question is: How do I add this to /etc/conf.d/net so that this
all occurs nice & clean whrn I start net.eth0?
Regardless, thanks for the assistance. I will post with further news as
I learn. Anyone with any experience with this subject, please know that
your past and future assistance is appreciated.
Cheers,
Summers
Konstantin Astafjev wrote:
> Hello M,
>
> Monday, December 3, 2007, 8:46:58 PM, you wrote:
>
>> I have a rather pressing issue with IP aliasing. So, my ISP assigns IPs
>> via dhcp using the MAC address to bind it statically. What I need to
>> do is get multiple static public IPs via their dhcp server. My ISPs
>> reliance on dhcp presents an interesting problem. How am I to acquire
>> multiple static public IPs from one NIC, say eth0, if their dhcp server
>> requires a unique MAC address per IP? I have tried using macchanger,
>> but it doesn't work for aliases alone. It changes the MAC for the main
>> interface, eth0, not eth0:{0,N}.
>>
>
> If I'm not mistaken you have 3 options:
>
> - force your ISP make some static rules mac=some_IPs in their
> switches/routers. I guess they forcing clients to use DHCP because
> of "dhcp snooping" and "arp inspection" features helps them filter
> alien ips&macs.
>
> - take a simple switch and some NICs with different MACs.
> Quantity depends on how many IPs do you need. ;)
>
> - the craziest one: take vlan switch, on your NIC create some VLANs,
> change MAC address on each VLAN.
>
> AFAIK, DHCP assigning a different IPs simultaneously on one MAC impossible.
>
>
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