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Old 08-02-2012, 02:33 PM
Birta Levente
 
Default IP range

On 02/08/2012 17:24, Johnny Hughes wrote:
> On 08/02/2012 09:00 AM, Birta Levente wrote:
>> Hi all
>>
>> Can someone explain me this:
>>
>> ifcfg-eth0-range1:
>> ONBOOT="yes"
>> IPADDR_START="192.168.1.48"
>> IPADDR_END="192.168.1.55"
>> CLONENUM_START="1"
>>
>> Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ?
>>
>> OS: Centos 6.3/64bit
>>
>>
>> Thanks
>>
>> Levi
>>
>> # ifconfig
>>
>> eth0:1 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>> inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> Interrupt:16 Memory:fbee0000-fbf00000
>>
>> eth0:2 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>> inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> Interrupt:16 Memory:fbee0000-fbf00000
>>
>> eth0:3 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>> inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> Interrupt:16 Memory:fbee0000-fbf00000
>>
>> eth0:4 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>> inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> Interrupt:16 Memory:fbee0000-fbf00000
>>
>> eth0:5 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>> inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> Interrupt:16 Memory:fbee0000-fbf00000
>>
>> eth0:6 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>> inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> Interrupt:16 Memory:fbee0000-fbf00000
>>
>> eth0:7 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>> inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> Interrupt:16 Memory:fbee0000-fbf00000
>>
>> eth0:8 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>> inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> Interrupt:16 Memory:fbee0000-fbf00000
>
> That is obviously not going to work ... a 255.255.255.252 mask is a 4 IP
> subnet, with only 2 usable addresses and a network number and a
> broadcast address. The only free addresses in
> 192.168.1.48/255.255.255.252 are .49 and .50
>
> The Broadcast and Mask settings are likely in your ifcfg-eth0 file and
> not in the range file at all.
>
> The Mask would either be set manually in ifcfg-eth0 ... or by the DHCP
> server if you get DHCP. The Broadcast address would automatically be set
> based on the Mask, unless it is overridden in ifcfg-eth0.
>
> If the address is set via DHCP, you need to change the subnet mask on
> the DHCP server as that is where it comes from.
>
> If you want 8 usable addresses (including the Network number, a gateway
> address, and a Broadcast address), that would mean you need at least 11
> IPs in that subnet ... the closest fit would be a 255.255.255.240 subnet
> (which has 16 addresses). If you were to want to use th 255.255.255.240
> subnet, then 192.168.1.48 would not be available as it would the the
> Network number for that subnet ... the usable addresses would be
> 192.168.1.49-63 that case and the Broadcast Address would be 192.168.1.64
>
> Since this is on a private network, why are you not just using the full
> 192.168.1.0 network with a 255.255.255.0 subnet?
>
> I guess the real question is, what are you trying to do
>
>
>
>
>
>
> _______________________________________________
> CentOS mailing list
> CentOS@centos.org
> http://lists.centos.org/mailman/listinfo/centos
>

I have eth0 with public IP, netmask is 255.255.255.252.
Additionally I own 8 public IPs xxx.xxx.xxx.48-55 with class subnet mask
255.255.255.248

If I set up with ifconfig eth0 to 7) xxx.xxx.xxx.(48-55) netmask
255.255.255.255 it's work.

But if I set up the ifcfg-eth00-7) files with the same IP and netmask
it's not work. ifconfig show me the 255.255.255.252 netmask even if in
file other netmask is specified.
The same situation in ifcfg-eth0-range1 case.


Thanks

Levi





_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 
Old 08-02-2012, 02:52 PM
Johnny Hughes
 
Default IP range

On 08/02/2012 09:33 AM, Birta Levente wrote:
> On 02/08/2012 17:24, Johnny Hughes wrote:
>> On 08/02/2012 09:00 AM, Birta Levente wrote:
>>> Hi all
>>>
>>> Can someone explain me this:
>>>
>>> ifcfg-eth0-range1:
>>> ONBOOT="yes"
>>> IPADDR_START="192.168.1.48"
>>> IPADDR_END="192.168.1.55"
>>> CLONENUM_START="1"
>>>
>>> Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ?
>>>
>>> OS: Centos 6.3/64bit
>>>
>>>
>>> Thanks
>>>
>>> Levi
>>>
>>> # ifconfig
>>>
>>> eth0:1 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>> inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>
>>> eth0:2 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>> inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>
>>> eth0:3 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>> inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>
>>> eth0:4 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>> inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>
>>> eth0:5 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>> inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>
>>> eth0:6 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>> inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>
>>> eth0:7 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>> inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>
>>> eth0:8 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>> inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> Interrupt:16 Memory:fbee0000-fbf00000
>> That is obviously not going to work ... a 255.255.255.252 mask is a 4 IP
>> subnet, with only 2 usable addresses and a network number and a
>> broadcast address. The only free addresses in
>> 192.168.1.48/255.255.255.252 are .49 and .50
>>
>> The Broadcast and Mask settings are likely in your ifcfg-eth0 file and
>> not in the range file at all.
>>
>> The Mask would either be set manually in ifcfg-eth0 ... or by the DHCP
>> server if you get DHCP. The Broadcast address would automatically be set
>> based on the Mask, unless it is overridden in ifcfg-eth0.
>>
>> If the address is set via DHCP, you need to change the subnet mask on
>> the DHCP server as that is where it comes from.
>>
>> If you want 8 usable addresses (including the Network number, a gateway
>> address, and a Broadcast address), that would mean you need at least 11
>> IPs in that subnet ... the closest fit would be a 255.255.255.240 subnet
>> (which has 16 addresses). If you were to want to use th 255.255.255.240
>> subnet, then 192.168.1.48 would not be available as it would the the
>> Network number for that subnet ... the usable addresses would be
>> 192.168.1.49-63 that case and the Broadcast Address would be 192.168.1.64
>>
>> Since this is on a private network, why are you not just using the full
>> 192.168.1.0 network with a 255.255.255.0 subnet?
>>
>> I guess the real question is, what are you trying to do
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> CentOS mailing list
>> CentOS@centos.org
>> http://lists.centos.org/mailman/listinfo/centos
>>
> I have eth0 with public IP, netmask is 255.255.255.252.
> Additionally I own 8 public IPs xxx.xxx.xxx.48-55 with class subnet mask
> 255.255.255.248
>
> If I set up with ifconfig eth0 to 7) xxx.xxx.xxx.(48-55) netmask
> 255.255.255.255 it's work.
>
> But if I set up the ifcfg-eth00-7) files with the same IP and netmask
> it's not work. ifconfig show me the 255.255.255.252 netmask even if in
> file other netmask is specified.
> The same situation in ifcfg-eth0-range1 case.

What if you do this:

ifcfg-eth0-range1:
ONBOOT="yes"
IPADDR_START="192.168.1.49"
IPADDR_END="192.168.1.54"
CLONENUM_START="1"
BROADCAST=192.168.1.55
NETMASK=255.255.255.248
NETWORK=192.168.1.48

(with a .248 subnet, you can not use the first address (192.168.1.48) or
the last address (192.168.1.55) on a device, they are the Network
Address and the Broadcast Address ... so an 8 IP subnet has 6 usable
addresses. Also, one of those 6 addresses will also need to be assigned
to the gateway router if you need to talk to another network, so you
really only have 5 addresses that you can assign for use).


_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 
Old 08-02-2012, 03:07 PM
Birta Levente
 
Default IP range

On 02/08/2012 17:52, Johnny Hughes wrote:
> On 08/02/2012 09:33 AM, Birta Levente wrote:
>> On 02/08/2012 17:24, Johnny Hughes wrote:
>>> On 08/02/2012 09:00 AM, Birta Levente wrote:
>>>> Hi all
>>>>
>>>> Can someone explain me this:
>>>>
>>>> ifcfg-eth0-range1:
>>>> ONBOOT="yes"
>>>> IPADDR_START="192.168.1.48"
>>>> IPADDR_END="192.168.1.55"
>>>> CLONENUM_START="1"
>>>>
>>>> Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ?
>>>>
>>>> OS: Centos 6.3/64bit
>>>>
>>>>
>>>> Thanks
>>>>
>>>> Levi
>>>>
>>>> # ifconfig
>>>>
>>>> eth0:1 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>>> inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252
>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>>
>>>> eth0:2 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>>> inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252
>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>>
>>>> eth0:3 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>>> inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252
>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>>
>>>> eth0:4 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>>> inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252
>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>>
>>>> eth0:5 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>>> inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252
>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>>
>>>> eth0:6 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>>> inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252
>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>>
>>>> eth0:7 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>>> inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252
>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>> Interrupt:16 Memory:fbee0000-fbf00000
>>>>
>>>> eth0:8 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00
>>>> inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252
>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>> Interrupt:16 Memory:fbee0000-fbf00000
>>> That is obviously not going to work ... a 255.255.255.252 mask is a 4 IP
>>> subnet, with only 2 usable addresses and a network number and a
>>> broadcast address. The only free addresses in
>>> 192.168.1.48/255.255.255.252 are .49 and .50
>>>
>>> The Broadcast and Mask settings are likely in your ifcfg-eth0 file and
>>> not in the range file at all.
>>>
>>> The Mask would either be set manually in ifcfg-eth0 ... or by the DHCP
>>> server if you get DHCP. The Broadcast address would automatically be set
>>> based on the Mask, unless it is overridden in ifcfg-eth0.
>>>
>>> If the address is set via DHCP, you need to change the subnet mask on
>>> the DHCP server as that is where it comes from.
>>>
>>> If you want 8 usable addresses (including the Network number, a gateway
>>> address, and a Broadcast address), that would mean you need at least 11
>>> IPs in that subnet ... the closest fit would be a 255.255.255.240 subnet
>>> (which has 16 addresses). If you were to want to use th 255.255.255.240
>>> subnet, then 192.168.1.48 would not be available as it would the the
>>> Network number for that subnet ... the usable addresses would be
>>> 192.168.1.49-63 that case and the Broadcast Address would be 192.168.1.64
>>>
>>> Since this is on a private network, why are you not just using the full
>>> 192.168.1.0 network with a 255.255.255.0 subnet?
>>>
>>> I guess the real question is, what are you trying to do
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> CentOS mailing list
>>> CentOS@centos.org
>>> http://lists.centos.org/mailman/listinfo/centos
>>>
>> I have eth0 with public IP, netmask is 255.255.255.252.
>> Additionally I own 8 public IPs xxx.xxx.xxx.48-55 with class subnet mask
>> 255.255.255.248
>>
>> If I set up with ifconfig eth0 to 7) xxx.xxx.xxx.(48-55) netmask
>> 255.255.255.255 it's work.
>>
>> But if I set up the ifcfg-eth00-7) files with the same IP and netmask
>> it's not work. ifconfig show me the 255.255.255.252 netmask even if in
>> file other netmask is specified.
>> The same situation in ifcfg-eth0-range1 case.
>
> What if you do this:
>
> ifcfg-eth0-range1:
> ONBOOT="yes"
> IPADDR_START="192.168.1.49"
> IPADDR_END="192.168.1.54"
> CLONENUM_START="1"
> BROADCAST=192.168.1.55
> NETMASK=255.255.255.248
> NETWORK=192.168.1.48
>
> (with a .248 subnet, you can not use the first address (192.168.1.48) or
> the last address (192.168.1.55) on a device, they are the Network
> Address and the Broadcast Address ... so an 8 IP subnet has 6 usable
> addresses. Also, one of those 6 addresses will also need to be assigned
> to the gateway router if you need to talk to another network, so you
> really only have 5 addresses that you can assign for use).
>
>
>
>
> _______________________________________________
> CentOS mailing list
> CentOS@centos.org
> http://lists.centos.org/mailman/listinfo/centos
>

Nope....

Work only .49 and .50

I bought 8 public IP-s ... so 8 IPs have to get work.
In the hosting specification this IPs is usable with xxx.xxx.xxx.48-55
with subnet mask 255.255.255.255 with no gateway.

As I sad, works perfectly with this command (8 times, of course ):
#ifconfig eth0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255

Thanks

Levi







_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos


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pq7gprngpr7gprjgpprgpr/gpqwvR2VuZXJhbCBTZWNyZXRhcnkK4Kar4Ka+4KaJ4Kao4KeN4 Kah
4KeH4Ka24KaoIOCmq+CmsCDgppPgpqrgp4fgpqgg4Ka44KeL4K aw4KeN4Ka4IOCmuOCmsuCmv+Cm
ieCmtuCmqOCmuCDgpqzgpr7gpoLgprLgpr7gpqbgp4fgprYvRm 91bmRhdGlvbiBmb3IgT3BlbiBT
b3VyY2UKU29sdXRpb25zIEJhbmdsYWRlc2guCg==
--20cf307f362e57782904c649c7e4
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

Dear garyk<div><br></div><div>I don't know what architecture are you us=
ing of Ubuntu 12.04 (32bit or 64bit). Though, please try the following afte=
r removing your current driver installation and the printer.</div><div><br>
</div><div><pre style=3D"margin-top:0px;margin-bottom:10px;padding-top:5px;=
padding-right:5px;padding-bottom:5px;padding-left:5px;border-top-width:0px;=
border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border=
-style:initial;border-color:initial;font-size:14px;vertical-align:baseline;=
background-color:rgb(224,224,224);overflow-x:auto;overflow-y:auto;width:aut=
o;max-height:600px;font-family:'Ubuntu Mono','Ubuntu Beta Mono =
A',Consolas,'Bitstream Vera Sans Mono','Courier New',Co=
urier,monospace;color:rgb(51,51,51);line-height:17px;text-align:left">
<code style=3D"margin-top:0px;margin-right:0px;margin-bottom:0px;margin-lef=
t:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px=
;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border=
-left-width:0px;border-style:initial;border-color:initial;vertical-align:ba=
seline;font-family:'Ubuntu Mono','Ubuntu Beta Mono A',Conso=
las,'Bitstream Vera Sans Mono','Courier New',Courier,monosp=
ace;color:rgb(34,34,34)">sudo add-apt-repository ppa:michael-gruz/canon-tru=
nk
sudo apt-get update
sudo apt-get install cnijfilter-common</code></pre></div><div><br></div><di=
v>Plz let us know if this=C2=A0solves your problem.=C2=A0</div><div><br></d=
iv><div>With regards</div><div>-- <br>=E0=A6=B0=E0=A6=BF=E0=A6=82/ring<br>+=
8801671411437<br><br>=E0=A6=AE=E0=A6=B9=E0=A6=BE=E 0=A6=B8=E0=A6=9A=E0=A6=BF=
=E0=A6=AC/General Secretary<br>
=E0=A6=AB=E0=A6=BE=E0=A6=89=E0=A6=A8=E0=A7=8D=E0=A 6=A1=E0=A7=87=E0=A6=B6=E0=
=A6=A8 =E0=A6=AB=E0=A6=B0 =E0=A6=93=E0=A6=AA=E0=A7=87=E0=A6=A8 =E0=A6=B8=E0=
=A7=8B=E0=A6=B0=E0=A7=8D=E0=A6=B8 =E0=A6=B8=E0=A6=B2=E0=A6=BF=E0=A6=89=E0=
=A6=B6=E0=A6=A8=E0=A6=B8 =E0=A6=AC=E0=A6=BE=E0=A6=82=E0=A6=B2=E0=A6=BE=E0=
=A6=A6=E0=A7=87=E0=A6=B6/Foundation for Open Source Solutions Bangladesh.<b=
r>
</div>

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Old 08-02-2012, 03:49 PM
John Doe
 
Default IP range

From: Birta Levente <blevi.linux@gmail.com>

> I bought 8 public IP-s ... so 8 IPs have to get work.
> In the hosting specification this IPs is usable with xxx.xxx.xxx.48-55
> with subnet mask 255.255.255.255 with no gateway.
> As I sad, works perfectly with this command (8 times, of course ):
> #ifconfig eth0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255

So maybe you do not want to (or cannot) use an ifcfg range file
and just use 1 eth0 file + 7 alias files...

JD
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Old 08-02-2012, 07:45 PM
Scott Silva
 
Default IP range

<snip>
> Nope....
>
> Work only .49 and .50
>
> I bought 8 public IP-s ... so 8 IPs have to get work.
> In the hosting specification this IPs is usable with xxx.xxx.xxx.48-55
> with subnet mask 255.255.255.255 with no gateway.
>
> As I sad, works perfectly with this command (8 times, of course ):
> #ifconfig eth0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255
>
> Thanks
>
> Levi
>
It doesn't work that way... You may think you bought 8 ip's, but you can only
pass traffic on 6... That is how it works... You buy 16, and only 14 work. The
first and last address are as Johnny said...

http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing



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Old 08-02-2012, 07:50 PM
Stephen Harris
 
Default IP range

On Thu, Aug 02, 2012 at 12:45:46PM -0700, Scott Silva wrote:
> It doesn't work that way... You may think you bought 8 ip's, but you can only
> pass traffic on 6... That is how it works... You buy 16, and only 14 work. The
> first and last address are as Johnny said...

It very much depends on if he bought a routed subnet or bought 8
individual IPs. It's very possible the OP _does_ have 8 IPs to play
with but, because it's not a subnet, he may need to configure them
individually.


(I had a friend who bought 4 IPs from BellAtlantic DSL in the late 90s
that were 4 available IPs and not a routed subnet; his OpenBSD firewall
machine would proxy-arp for the Windows machines sitting behind it)

--

rgds
Stephen
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Old 08-02-2012, 07:54 PM
John R Pierce
 
Default IP range

On 08/02/12 12:45 PM, Scott Silva wrote:
> It doesn't work that way... You may think you bought 8 ip's, but you can only
> pass traffic on 6... That is how it works... You buy 16, and only 14 work. The
> first and last address are as Johnny said...

I've also seen DSL networks like this where those extra IPs are bridged
not routed. in these cases, you use the same gateway as the 'main' IP,
but usually the main IP has a /24 or whatever mask that encompasses ALL
the IPs.

regardless, the OP should contact the ISP and find out what the mask and
gateway are for the extra IPs.


--
john r pierce N 37, W 122
santa cruz ca mid-left coast

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Old 08-02-2012, 09:05 PM
Scott Silva
 
Default IP range

on 8/2/2012 12:54 PM John R Pierce spake the following:
> On 08/02/12 12:45 PM, Scott Silva wrote:
>> It doesn't work that way... You may think you bought 8 ip's, but you can only
>> pass traffic on 6... That is how it works... You buy 16, and only 14 work. The
>> first and last address are as Johnny said...
>
> I've also seen DSL networks like this where those extra IPs are bridged
> not routed. in these cases, you use the same gateway as the 'main' IP,
> but usually the main IP has a /24 or whatever mask that encompasses ALL
> the IPs.
>
> regardless, the OP should contact the ISP and find out what the mask and
> gateway are for the extra IPs.
>
>
I guess with the ipv4 drought, this will become even more common... Until
everyone gets to ipv6...


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Old 08-03-2012, 06:27 AM
Birta Levente
 
Default IP range

On 02/08/2012 22:45, Scott Silva wrote:
> <snip>
>> Nope....
>>
>> Work only .49 and .50
>>
>> I bought 8 public IP-s ... so 8 IPs have to get work.
>> In the hosting specification this IPs is usable with xxx.xxx.xxx.48-55
>> with subnet mask 255.255.255.255 with no gateway.
>>
>> As I sad, works perfectly with this command (8 times, of course ):
>> #ifconfig eth0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255
>>
>> Thanks
>>
>> Levi
>>
> It doesn't work that way... You may think you bought 8 ip's, but you can only
> pass traffic on 6... That is how it works... You buy 16, and only 14 work. The
> first and last address are as Johnny said...
>
> http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing
>
>
>
> _______________________________________________
> CentOS mailing list
> CentOS@centos.org
> http://lists.centos.org/mailman/listinfo/centos
>
Thank you all for your time ...

But I have another question:

Why is a difference in setting up with icfg-eth0:0 and ifconfig ?
As I sad, setting up all 8 IP-s with ifconfig works perfectly.
Why if I specify explicitly the subnet mask in ifcfg-eth0:0 then appear
other?

Thanks

Levi




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Old 08-03-2012, 10:20 AM
Birta Levente
 
Default IP range

On 02/08/2012 22:54, John R Pierce wrote:
> On 08/02/12 12:45 PM, Scott Silva wrote:
>> It doesn't work that way... You may think you bought 8 ip's, but you can only
>> pass traffic on 6... That is how it works... You buy 16, and only 14 work. The
>> first and last address are as Johnny said...
>
> I've also seen DSL networks like this where those extra IPs are bridged
> not routed. in these cases, you use the same gateway as the 'main' IP,
> but usually the main IP has a /24 or whatever mask that encompasses ALL
> the IPs.
>
> regardless, the OP should contact the ISP and find out what the mask and
> gateway are for the extra IPs.
>
>
It's a bug in centos 6

http://bugs.centos.org/view.php?id=5391

PREFIX configured in ifcfg-eth0 is overrule the subnet mask in aliases.

Solution: removed PREFIX from ifcfg-eth0


Thanks to all

Levi





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