ipv6 configuration

s_hcl · 03-28-2012, 11:49 PM

Kindly let me know is it possible to assign a local link address which is generated automatically to the applications .

If i add a address manually ,can i use that address .

I need to run tomcat6 in redhat 5 ,pl let me know how to configure tomcat or any other applications to run on ipv6 .

Also let me know whether in the ifcfg-eth0 properties ,can both Ipv4 and Ipv6 co-exist .

EricTRA · 03-29-2012, 02:54 AM

Hello,

What do you mean by 'generated automatically'? You can assign an IPv6 address just like you assign an IPv4 one, dynamically using DHCP server that's configured to hand out IPv6 addresses or manually in the configuration file. You can create a 'site global' range to use for your own. Have a look at this site for utilities to generate a range.

I don't know how to setup Tomcat to use IPv6 but I'm sure somebody will provide a link or information soon. To configure Red Hat, first enable IPv6 networking and then configure the IPv6 addresses in the ifcfg-ethX file(s) as needed. And yes IPv4 and IPv6 can co-exist. Just add:

Code:

IPV6INIT=yes
IPV6ADDR=<your IPv6 address>

Kind regards,

Eric

s_hcl · 03-29-2012, 04:05 AM

By automatically assigned address , meant about the Local link addresses which is derived from the MAC address of the NIC card.
Regarding DHCPv6 ,i need to study the same ,as how to allocate a range of IPv6 addresses ,like we used to do it for Ipv4 ,say 192.168.1.2 to 192.168.1.55

From where can i get a Site global range of Ip addresses.

I had entered the code which u had mentioned in the ifcfg-eth0 file for manually entering the Ipv6 address . But for some reason it didnt show up ,even after i restarted the network service ,Hence i added it manually

ip -6 addr add <ipv6addr> dev eth0

EricTRA · 03-29-2012, 04:16 AM

Hi,

I'm pretty new to IPv6 too and have had some issues with the link local (fe80) addresses. The can only be used for local link and the packets will not be forwarded by routers to other links. I got confused about that because the link local is a whole new concept. I've found this basic information very useful.

You can use the site I pointed to in my previous post to create a range of IPv6 addresses or click on this link which will have a configuration for IPv6 site local range I've used for a local testing network at work.
IPv6 Site local range

Did you enable IPv6 networking in /etc/sysconfig/network before restarting the network service? I'm guessing not since it's not enable by default and if the IPv6 address didn't show up, that might be an indicator.

Kind regards,

Eric

s_hcl · 03-29-2012, 04:55 AM

I had enabled

NETWORKING_IPV6=YES in /etc/sysconfig/networking

also

IPV6INIT=YES IN /etc/sysconfig/network-scripts/init.ipv6-global

Can u guide me on creating ipv6 site local range addresses,as i am confused ,how to do the same

EricTRA · 03-29-2012, 05:02 AM

Hi,

It's as simple as clicking on the link I provided in my latest post. That will give you this:

Code:

Start Range: fd88:3be1:fee4:8c5e:0:0:0:0
End Range: fd88:3be1:fee4:8c5e:0:0:0:ff

No. of host: 256

Kind regards,

Eric

s_hcl · 03-29-2012, 05:19 AM

Excuse if i am being a Novice ,since Ipv6 has been there ,but need to use it for testing between Linux and Widnows

I could generate the hosts as mentioned in the link

But kindly let me know ,how do i pick up the address as mentioned below with the prefix length for generation..

FD88:3BE1:FEE4:8C5E::0/120

Prefix 120 ,means 128-120 = 8 ,that means i can use 8 bits for the host part ,fd88:3be1:fee4:8c5e:0:0:0:ff ,i.e the ff part which is mentioned ( 4+4 bits)

Start Range:
fd88:3be1:fee4:8c5e:0:0:0:0 End Range:
fd88:3be1:fee4:8c5e:0:0:0:ff No. of host: 256

So the addresses would be

fd88:3be1:fee4:8c5e:0:0:0:0
fd88:3be1:fee4:8c5e:0:0:0:1
fd88:3be1:fee4:8c5e:0:0:0:2
.......
fd88:3be1:fee4:8c5e:0:0:0:ff

EricTRA · 03-29-2012, 05:22 AM

Hello,

That's correct. That would be your IPv6 addresses taking into account the hexadecimal numeration.
And as indicated in the documentation you can substitute any sequence of 0 by :: but only once in an address, so:

Code:

fd88:3be1:fee4:8c5e:0:0:0:1

is the same as:

Code:

fd88:3be1:fee4:8c5e::1

Kind regards,

Eric

s_hcl · 03-29-2012, 05:34 AM

Ya ,regarding the leading zeros i am fine with it .

Kindly let me know ,from where should i take the starting address fd88:3be1:fee4:8c5e,can i refer it from somewhere.

I mean just as we assign pvt ip addresses in Ipv4 like 192.168.1.1 ,so how do we take the above address.

EricTRA · 03-29-2012, 05:42 AM

Hi,

I suggest you to read the documentation about Site local addresses I pointed you too. That will make clear how to construct an IPv6 range for your network/company which you can use to communicate between devices on a IPv6 level. IPv6 address types and formats.

Kind regards,

Eric

s_hcl · 03-29-2012, 05:53 AM

The ipv6 private address space is described as "fc00::/7".
So i needed to know how to we specify the ipv6 address-- fd88:3be1:fee4:8c5e:0:0:0:1 ,is there any tool to generate or specify the same .

Since in ipv4 we knew that the ranges were

10.0.0.0 to 10.255.255.255
172.16.0.0 to 172.31.255.255
192.168.0.0 to 192.168.255.255

So we could pick an address ,say 192.168.1.0 ,192.168.10.0 ......

So ,similarly ,for ipv6 PRivate Ip range is fc00::/7 , hence my query is how do i generate fd88:3be1:8c5e:.....Can i randomly put any numbers for the range of hexa decimals 0-9 ,A-F ,a-f .

EricTRA · 03-29-2012, 05:59 AM

Hi,

Basically that's how you would do it, the important part is the first part of the address, the first 10 bits. The rest up to the last part can be used to 'separate' networks.

Quote:

After the 10 fixed bits is a 54-bit Subnet ID field that provides 54 bits with which you can create subnets within your organization. You can have a flat subnet structure, or you can divide the high order bits of the Subnet ID field to create a hierarchical and summarize able routing infrastructure. After the Subnet ID field is a 64-bit Interface ID field that identifies a specific interface on a subnet.

Kind regards,

Eric

s_hcl · 03-29-2012, 11:44 PM

Thanks, i will go thru the links and understand the same .

Normally i think ,the blocks will be issued by the ISP .

EricTRA · 03-30-2012, 12:41 AM

Hi,

For AFAIK the ISP only will issue the global address ranges (2000::/3) and not the ones you can use for site local addresses.

Quote:

Global 2000::/3
These are assigned by the IANA and used on public networks. They are equivalent to IPv4 global (sometimes called public) addresses. ISPs summarize these to provide scalability in the Internet.

Kind regards,

Eric