Networking :: Make Practical Use Of Link Scope IPv6 Addresses?

Jun 23, 2010

I am trying to use link scope IPv6 addresses to permit two machines to connect using IPv6, but I cannot figure out how to do it without specifying the interface to use on every connection. Here is an example ping:

[root@ppatel-brn1 ~]# ping6 -c 3 fe80::204:75ff:feb6:2994
connect: Invalid argument
[root@ppatel-brn1 ~]# ping6 -c 3 -I eth0 fe80::204:75ff:feb6:2994
PING fe80::204:75ff:feb6:2994(fe80::204:75ff:feb6:2994) from fe80::214:22ff:febd:7c1f eth0: 56 data bytes
64 bytes from fe80::204:75ff:feb6:2994: icmp_seq=0 ttl=64 time=0.836 ms
64 bytes from fe80::204:75ff:feb6:2994: icmp_seq=1 ttl=64 time=0.286 ms
64 bytes from fe80::204:75ff:feb6:2994: icmp_seq=2 ttl=64 time=0.280 ms

[Code]...

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Ubuntu Networking :: IPv6 Addresses Cannot Be Assigned

Sep 18, 2010

I'm trying to assign like 80 IPv6 addresses on eth0 for virtual webhosting, but after 55 addresses I get the following error:# ip addr add 2a01:9f8:a171:1651::4b:a8af dev eth0 RTNETLINK answers: File exists.What's the problem? I don't understand that error message at all. Is the number of IPv6 addresses per device somehow limited?Ubuntu 10.4.1 server, 64 bit.

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Networking :: Unable To Get IPv6 Addresses Using Ioctl()

Feb 4, 2011

I am able to retrieve IPv4 addresses with ioctl. But it is not returning IPv6 addresses. My requirement is to get both IPv4 and IPv6 addresses. I can not use getifaddrs() since it has to be common code between linux, solaris and aix. Solaris and AIX are not having getifaddrs(). Following code is returning only IPv4 addresses.

Code:
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>

[Code]....

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Networking :: Support 50K IPv6 Addresses On A Single Machine?

Feb 2, 2010

Does anyone know if there is any way to configure 50K "virtual" IPv6 addresses on loopback device in Linux?
The aim is not to add all 50K IPv6 addresses one by one on the loopback/ETH device which will probably mess up the ip table on the system. In IPv4, I am able to achieve that by specifying the IP address subnet on loopback device (e.g: "ip addr add 10.1.0.0/16 dev lo"). The same command does not seem to work the same way for IPv6. It only adds a single IPv6 address on loopback device and it automatically adds an "unreachable route" entry on the ipv6 route table for that IPv6 network prefix.

The reason I need this is because I am working on an application which tries to simulate 50K IPv6 addresses on a single Linux box. The kernel version I am currently using is RHEL 2.6.9.55.

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Networking :: Sending / Receiving Between Two Systems Using IPv6 Addresses

Mar 8, 2010

We have connected two systems with ethernet cables and have configured the two systems with ipv6 addresses. The IP of one system is 2001:0db8:0:f101::1 (let's say X::1) (This system runs OS Fedora 10) and the other is 2001:0db8:0:f101::2. (Let's say X::2) (This system runs OpenSuSE 10.3) We are able to ping from both systems to the other. We are able to ssh into the one with IP X::2 from the one with IP X::1, but not vice versa.

We have disabled iptables on both systems by using the following commands:
/etc/init.d/iptables save
/etc/init.d/iptables stop
on the fedora 10 system and
# iptables -X
# iptables -t nat -F
# iptables -t nat -X
# iptables -t mangle -F
# iptables -t mangle -X
# iptables -P INPUT ACCEPT
# iptables -P FORWARD ACCEPT
# iptables -P OUTPUT ACCEPT
on the openSuse system.

The error we get in trying to ssh from the openSuse system to the fedora system is:
ssh: connect to host 2001:0db8:0:f101::1 port 22: Connection refused

We're trying to write server and client code to send data from one system to the other using SOCK_DGRAM. The code works fine when we run both the client and server on the same system. However, we are not able to send data from one system to another when we use the IPv6 addresses to run the client and server programs.

The error we get is:
sendto(): Operation not permitted

The codes we are using for the server and client programs can be found here in beej's guide here : [URL]. We've only substituted the appropriate addresses in the right places... We've disabled the iptables...

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Fedora Networking :: Configuring IPv6 (network) Tunnelling - Getting Only Internal Addresses From DHCP

Aug 25, 2011

I am trying to configure my IPv6 network. My computers are behind a Fedora gateway IPv6-configured, which is working great. But for computers inside my network, it seems I am getting only internal addresses from DHCP. Here is my ifconfig for an internal computer:

Quote: em1 Link encap:Ethernet HWaddr F4:6D:04:34:92:2B inet addr:192.168.0.184 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::f66d:4ff:fe34:922b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:744250 errors:0 dropped:0 overruns:0 frame:0 TX packets:548987 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:841392242 (802.4 MiB) TX ytes:60384500 (57.5 MiB) Interrupt:18 Memory:f7100000-f7120000

he-ipv6 Link encap:IPv6-in-IPv4 inet6 addr: 2001:470:1c:611::3/64 Scope:Global inet6 addr: fe80::cea7:b778/128 Scope:Link UP POINTOPOINT RUNNING NOARP MTU:1480 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:61 dropped:0 overruns:0 carrier:61 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

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Ubuntu Networking :: Ipv6 Link-local Address Not Configured On Eth0 (server)

Feb 18, 2010

I added an init script numbered just before bind9 starts, which needs to see the ipv6 link-local address on eth0. Sometimes this address is not configured, yet. In all cases it eventually is configured.

I am unable to find any script that is configuring the ipv6 link-local address (which is in part based on the MAC address). Does anyone know if there is some script or program that is supposed to be doing this, or is it an internal kernel function?

One workaround I am considering is making this init script go into a loop around sleep 1 to keep checking for the ipv6 address. But I'm concerned this might cause some problems. Any suggestions? I don't want to let it move on to start bind9 until the configuration this script does (more ipv6 addresses) is done.

This is on Ubuntu 9.10 server (for which there is not a prefix choice).

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Networking :: Referencing Hosts By (special) Hostname For IPv6 Link Local Address

Apr 30, 2010

I can reach other hosts by means of their global addresses by either the IP address or hostname (that has the global address). What I want to (also) do is have a hostname that references the IPv6 link local IP address (an AAAA record in DNS, or just the fe80::<whatever> address in /etc/hosts) and use that host name in commands to access that host. The problem is, an interface ID is needed when making such a reference.

It sure looks like the programs just pass the host name string on to the resolver library, which does not understand the significance of the '%' even though it could find and see that the name preceding the '%' is consistent with that being an IPv6 link local address (e.g. the logic could have been "split at first % and see if preceeding name is found as a link local address and accept that if so, or ignore the split otherwise" ... but it isn't). Is there a different syntax for this ... or was it overlooked in the design of programming around IPv6?I want to be able to address a host by its link local address, while still using a mnemonic instead of having to type the IPv6 address.

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Networking :: Error: "SIOCSIFADDR: Cannot Allocate Memory" Adding Virtual IPv6 Addresses

Apr 30, 2010

I get errors trying to virtual IPv6 Addresses i a lab environment. It works fine up to 2033 (?) adrressses, but when I try to add more i get "Cannot allocate memory" error:

# ifconfig eth0 add 2001:1b70:8282:2021:18:0:20:1
SIOCSIFADDR: Cannot allocate memory

This is on Ubuntu Server 9.10 (64-bit).

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OpenSUSE Network :: Assign IPv4 And IPV6 Static Addresses?

Feb 19, 2010

How do I assign IPv4 and IPv6 static addresses permanently in OpenSUSE 11.2? Currently I am only able to assign either IPv4 or IPv6 static address not both. I cannot find even the interfaces file(/etc/sysconfig/network/interfaces).

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Fedora Networking :: Ipv6 With Tunnel Broker - Better Client For Non Native Ipv6 Connectivity?

Jul 22, 2009

I used to play with gw6c ( a client for tunnel broker ) It works well with fedora9 , fedora 10, but not with leonidas. my rpm is gw6c-6.0-0.4.beta4.fc9.i386.rpm ( a little old!) when I tried to install i have got this: libcrypto.so.7 est ncessaire pou w6c-6.0-0.4.beta4.fc9.i386 I try to make a soft link to libcrypto.so.0.9.8k, but nothing; The question :-Is there a solution for that pb - did you know a better client for non native ipv6 connectivity?

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Fedora Networking :: FC15 IPV6 Wireless Router - No Longer Gets An IPv6 Address

Aug 31, 2011

I have been struggling to get FC15 to act as an IPv6 router for a while now, am sure I am missing something trivial.. The idea is that I have a ppp / adsl connection (this works fine), use the wireless card on my pc with hostapd and dhcpd to provide connections to other pcs (works fine), and radvd to delegate ipv6 addresses.

The issue seem to be that as soon as I turn on ipv6 forwarding (net.ipv6.conf.all.forwarding =1), the ppp connection no longer gets an IPv6 address. This means the router cannot ping any ipv6 address outside my network.

If I disable ipv6 routing, my router gets an IPv6 address on its ppp connection, and can ping things such as ipv6.google.com just fine, however (of course) no packets are forwarded from my network and radvd complains that forwarding is disabled.

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Networking :: D-Link DWL-g122 / Make It Work?

Jan 25, 2011

How to make it work?

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Fedora Networking :: Make A D-link Dwl-650+ Pcmcia Card Work Through Ndiswrapper?

Jul 29, 2009

I am trying to make a d-link dwl-650+ pcmcia card work through ndiswrapper method following the direction at:[URl]... The first step there is to install the "kmod-ndiswrapper" via yum.

But, how would I just download this package to a usb drive so that I can transfer it to the laptop that needs wireless networking. Is there an option in yum where I can just download the package, not intstall, so that I can save it somewhere?

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Networking :: Keep Some Port Out Of The Scope Of A VPN Connection ?

Oct 31, 2010

I have a server (192.168.1.9) in my network that is running a http server on port 5000. This server port have been opened (on my router 192.168.1.1) to be available from my public IP (on port 80).

I have recently installed openvpn to connect to a vpn, but I'd like to keep my http server available from my public IP (no need to have it available to the VPN network).

I'm completely lost and I don't know where to start ...

Here are some details about the route configuration :

Code:

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Ubuntu :: Contex Menu [Make Link] Make Same File Size?

Dec 17, 2010

I notice that when you try to Make link to any file or folder form context menu, It just copy the same file size? even when i tried to copy the link to external storage disk..

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Server :: Postfix Setup - Make Own Email Addresses

May 14, 2011

It wasn't too long ago that I discovered Linux/Ubuntu (in terms of actually USING it) and I've been completely blown away by the capabilities it puts in the user's hands! To think that someone can take an old desktop from a trash pile (literally, in my case) and turn it into a web server for ZERO dollars is absolutely crazy.

Anyway, I've been using said desktop as a sort of "dummy" machine to learn Linux. I want to be clear that I've got another computer for personal use and that I understand that setting up server software on any computer poses a security risk. Having said that, I have a few questions regarding mail servers and their setup on Ubuntu. Again - I'm comfortable with what I've done so far in Ubuntu (installing packages, terminal interaction, basic usage)

My question is mainly this: if you have, say, a domain name through DynDNS (let's say example123.com) and it points to an Ubuntu system, does something like Postfix enable you to make your own email addresses such as user1@example123.com and have an email server from wherever the Ubuntu system is?

I've been following the basic Postfix setup here and have had success so far (down to the "Adding your local domains to postfix" section) bu wanted to make sure that what I'm intending to do is what I'm doing (haha... i hope that makes sense). That is: get domain name at DynDNS, host pages on LAMPP server, use Postfix to facilitate incoming/outgoing email for that domain name.

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Ubuntu Networking :: Mount To Vista Needed For Apache - Symbolic Link Not Allowed Or Link Target Not Accessible

Apr 26, 2010

I have a problem where I'm using Ubuntu linux to mount a Windows Vista machine's USB drive and access it on the web using Apache. I did have the USB drive plugged into the Linux machine directly and that was working via the web. FollowSymLinks is on in httpd.conf

[Code]....

The mount works and I can see the files (see above) from my regular linux user account. If I make a test file in /mnt and soft link to that, I can see it on the web. So it's just the mount to the vista machine that seems to be a problem. It's supposed to be a simple read-only mount and the apache login should (I think) be able to see the same generic root access permissions.

log from apache: [Mon Apr 26 20:39:42 2010] [error] [client 99.99.99.99] Symbolic link not allowed or link target not accessible: /home/user1/pub_html/Music, referer: https://xx.xx.xx/~user1/music.html

The credentials have a login and password that matches a special read-only account on Vista. I can see the files on the system from Linux, but not via the web. As mentioned above, a different link to the same /mnt area works fine via the web. I've tried several different mount options with no success.

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Server :: Make Sendmail Silently Discard 'Catchall' Addresses

Aug 4, 2011

Using sendmail, I am trying to setup a catchall address to silently discard spam mail sent to undefined users. I don't want to bounce a reply for "no user" as this often goes back to munged or innocent addresses.

I have a number of domains, so my virtuser table currently looks rather like this:

Code:

The last line is the "catchall" which is intended to ensure that any undefined users from either my_domain.com or my_domain.co.uk is forwarded to the non-existent "catchall" user account. Note that all mail sent to my_domain.com is passed across to my_domain.co.uk at the very start so all the following rules should apply to messages received at both domains. (Both of these domains appear in the

Being non-existent, I setup the following rules in the access data table:

Code:

This way, if I send an email to 'user1@my_domain.com' it is received and delivered to user1@my_domain.co.uk, but if I send an email to 'rubbish@my_domain.com' it *should* be received and silently discarded.

Unfortunately what actually happens is the server responds with:

Now, (just for testing), I made "catchall" an alias for the "postmaster" account and the mail was then received and delivered into the postmaster mailbox. So I know the virtuser rule is working. The account "catchall", however, is not being silently dropped as desired in either configuration.

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Jul 8, 2010

But I never understood any practical use cases of pthread_key_create and set_specific and similar functions. I read the manual still I couldn't understand any particular/specific use cases for these

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General :: 64bit - Any Practical Method To Do Annotation On PDF

Jun 6, 2011

Adobe's official reader don't support do-annotation under Linux. Evince can't do.Reading PDF is the last thing on which I can not totally move to a pure Linux environment.

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Ubuntu :: Make A Link To A .exe File?

May 22, 2011

i got a small problem: i have some old software that used to run under windows.now i run it under wine, and it does just fine. but i cannot make a link to my desktop. when i go to the file in the directory, i choose right mousclick and then make link. then i copy the link to the desktop. but when i run the link from the desktop: i get errors: all bunch of files were not found. It seems like the link is actually the exe file itself ? or that the link execute the exe file at the directory of the place where the link is (that is the desktop directory)

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Ubuntu :: Make A Link To A Program That Needs A Certain Path?

Aug 10, 2010

in order to play "Gish" - I need to cd .gish./gish- otherwise it won't find it's files - it need the working path, how can I put that in a sigle line in my games menu ?

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General :: Use Make And Makefile To Compile And Link Some .cpp/.h

Sep 20, 2009

I've been trying to figure out how to use make and makefile to compile and link some .cpp/.h. All i seem to find on google says to read the README for the software. But this is my own created c++ project. Im just looking for a simple makefile for my own .cpp/.h files( about 20 total).

I have tried using 2 different makefile "examples" as a template, but neither worked. I am getting error saying "file1.cpp: no newline character at end of file". or something to that degree.

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General :: Make A Symbolic Link Read Only?

Feb 2, 2010

Can you make a symlink read only? I have about 100 users who all have a .login. They like to modify their .login, which is fine in most cases, but sometimes they do it wrong & it screws up a LOT of the things they are supposed to be doing. Because of this, I'm going to lock down all .logins & I thought, "wouldn't it be nice if we could modify one file & all users would get the modification?" So I'm currently testing having everyone's .login point to a central .login via symlink. It works fine, but it appears that the users can [re]move the link & replace it with a file, thus defeating the purpose. Can I lock down the symlink so the user cannot move or remove the link? FWIW, it must be a symbolic link (as opposed to a hard link) as the file it points to is on an NFS share (not the same file system).

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Programming :: HTML: Make A Link That Goes Absolutely Nowhere?

Jul 29, 2010

I need to make a link that goes absolutely nowhere, since it has an onclick event that uses javascript to show/hide content. It needs to look like a standard link and the mouse needs to change to the finger cursor like a standard link.

The following all don't work:

Code:

<a href="#" onclick="show_element('jetshop')">Read more...</a>
- moves to the top of the page.
<a href="" onclick="show_element('jetshop')">Read more...</a>

[code]....

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OpenSUSE Wireless :: Make Fails For New Realtek Drivers (D-Link DWA-131)

May 6, 2010

I am trying desperately to get my wireless n adapter to work. I had it running sporadically with ndiswrapper for some months now (it was always unreliable). Now I was very optimistic, when I found new driver sources from Realtek directly: Realtek I understand the DWA-131 is based on the Realtek 8192su chipset. Unfortunately the build fails:

[Code]...

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Ubuntu Networking :: No Ipv6 Ip From ISP?

Nov 29, 2010

I have Ubuntu 10.10 installed on my laptop. My ISP natively supports ipv6, but since last weekend, I do not get an ipv6 ip. When I use a live cd however, I do get an ipv6 ip. For as far as I can see, all settings (/etc/network/interface and the settings in network manager) are exactly the same.

Output of ifconfig:

Code:
eth0 Link encap:Ethernet HWaddr XX:XX:XX:XX:XX:XX
inet addr:XXX.XXX.XXX.XXX Bcast:XXX.XXX.XXX.XXX Mask:XXX.XXX.XXX.XXX
inet6 addr: XXXX::XXXX:XXXX:XXXX:XXXX/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

[Code].....

EDIT: is there a way to let the netwerk be automatically configured as happens during installation? It would be nice to start with a clean and new set of network config files as there were just after I installed Ubuntu on my system, without a full reinstall of my system.

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Networking :: Can't Use Ipv6 Although Getting Address?

Jun 30, 2009

I have a problem with my ipv6 connection: although I can't get ipv6 address with DHCP, I can't use ipv6 network. I tried [URL], and the tortoise is static. I want to fix it out , so I use 'ifconfig' to see my network configuration:

eth0 Link encap:Ethernet HWaddr 00:50:8d:ef:dd:06
inet addr:210.77.9.102 Bcast:210.77.11.255 Mask:255.255.252.0
inet6 addr: 2002:d24d:b64:4:250:8dff:feef:dd06/64 Scope:Global

[code]....

Some people told me that the fisrt ipv6 address was wrong and unsuitable for ipv6 connecting. I tried /ect/init.d/networking restart but it didn't work. How can I use the second address as my ipv6 address and fix the problem out ? Now it seems there is not problem with the ip adress but the route. After watching some video, I suddenly could use ipv6. I did 'ifconfig' again and nothing was different. However, the result from the command 'ip -f inet6 route' changed: the last default route was gone and there was only one default route.

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Networking :: Use Domain Name With IPv6?

Jan 12, 2010

I have installed Bind 9.6.1 on my linux pc. I have to resolve domain name using IPv6 address. I have made following entry in the /etc/resolv.conf file code...

address of the machine on which Bind is running. The problem is that I am not able to ping open-ims.test domain name. If I use IPv4, everything works fine but how to ping domain using IPv6.

I have also made changes in dnszone file by replacing IPv4 address with IPv6 address and also changing A to AAAA.

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