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  • Using u32 together with extension headers (how to jump over them?)

    - by bortzmeyer
    I'm trying to filter on some parts of the payload, for an IPv6 packet with extension headers (for instance Destination Options). ip6tables works fine with conditions like --proto udp or --dport 109, even when the packet has extension headers. Netfilter clearly knows how to jump over Destination Options to find the UDP header. Now, I would like to use the u32 module to match a byte in the payload (say "I want the third byte of the payload to be 42). If the packet has no extension headers something like --u32 "48&0x0000ff00=0x2800"` (48 = 40 bytes for the IPv6 header + 8 for the UDP header) works fine, If the packet has a Destination Options, it no longer matches. I would like to write a rule that will work whether the packet has Destination Options or not. I do not find a way to tell Netfilter to parse until the UDP header (something that it is able to do, otherwise --dport 109 would not work) then to leave u32 parse the rest. I'm looking for a simple way, otherwise, as BatchyX mentions, I could write a kernel module doing what I want.

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  • Howto setup a `veth` virtual network

    - by Reinder
    I'd like to setup three virtual network interfaces (veth) which can communicate with each other. To simulate a three node cluster, each program then binds to one veth interface. I'd like to do it without LXC if possible. I tried using: Created three veth pairs: sudo ip link add type veth Created a bridge sudo brctl addbr br0 Added one of each pair to the bridge: sudo brctl addif br0 veth1 sudo brctl addif br0 veth3 sudo brctl addif br0 veth5 Configured the interfaces: sudo ifconfig veth0 10.0.0.201 netmask 255.255.255.0 up sudo ifconfig veth2 10.0.0.202 netmask 255.255.255.0 up sudo ifconfig veth4 10.0.0.203 netmask 255.255.255.0 up Then I verified if is works using: ping -I veth0 10.0.0.202 but it doesn't :( The I added IP addresses to the veth1,veth3,veth5 and br0 interfaces in the 10.0.1.x/24 range. But that doesn't help. Any ideas? or a guide, all I find in how to use it with LXC. Or am I trying something that isn't possible?

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  • Disaster - partitions lost, data seemingly alive, how to recover?

    - by a2h
    I've used TestDisk and it's written my old partition structure of a ~20GiB partition for Vista, ~25GiB partition for 7 (but it now shows up as unallocated) and a ~400GiB partition for documents. What it's meant to be is a 30GiB partition for 7, some unallocated space, and a ~400GiB partition for documents. So currently, I have access to all my documents, but not any of the programs I've installed on C:, or AppData, because my boot partition is now supposedly a 20GB vista partition. I've tried using my Windows 7 install disc's repair function, but that did nothing beyond wasting about 10 minutes of my time. I'm currently posting from an Ubuntu live CD. Any help?

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  • Ignore Apache Default Server?

    - by Jakobud
    I run several vhosts on our Apache server. Whenever browse the server using either it's IP address or some other name that resolves to that address, but where a virtual host entry doesn't exist for that address I get the generic Apache test page: I want to change the server so I can specify a Virtual Host to see by default instead of the Apache Default Server page. I don't want to just modify the Default Server page either. I just need to be able to specify a Virtual Host to use instead. I added the following Virtual Host: <VirtualHost _default_:*> DocumentRoot /vhosts/default/public </VirtualHost> What I am reading is supposed to take priority over all other Virtual Hosts as the default. But this doesn't seem to take priority over the Apache Default Server/Host. What do I need to do here?

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  • putty 0.61 : why do I see "Access Denied" message after I enter my login id?

    - by anjanbacchu
    I use putty to login to my RHEL 5.3 server. I'm prompted to enter my login as "login as " and I enter my login Id. as soon as I press ENTER, I see a "Access Denied" message following which I'm prompted with password. I successfully enter password and I'm through -- no problems. I tried the same with putty 0.60(as opposed to above putty 0.61) but in this version, I don't get any "access denied" error. What should I make of this ? Is putty 0.61 version buggy ? P.S : If I login using ssh.exe(from cygwin), then I'm fine -- I don't get any "access denied" errors. Thank you,

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  • Problems using "at" with Apache

    - by Alex Padgett
    I'm trying to use a PHP script to create at jobs, but when it comes time to execute the jobs, nothing seems to be happening. I've tried to output any errors to log files, but have had no luck. It seems obvious that it's a permissions issue, because when I set apache to run as my personal user, everything works fine. However, when I exec wget directly from PHP, everything works fine so it seems that apache has the correct permissions to use it. The problem appears to be when using at in conjunction with apache. So I need to find a way to make this work with apache running as its own user. Here is the command I'm using: echo "wget -qO- http://example.com/" | at now + 1 minute 2>&1 Any ideas? EDIT: Apache can create the at jobs, it just seems that when they execute nothing is happening.

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  • Ubuntu stops auto-mounting flash drive

    - by Brian
    It seems that after being up for a few days, my Ubuntu system refuses to auto-mount hot-plugged USB disks (i.e. flash drives). The output from dmesg shows that the kernel recognizes the device correctly. The only solution I'm aware of at the moment is to reboot (logging out may work as well, but the impact is the same since I have a bunch of stuff open and it takes a few minutes to get everything situated after startup/login). I thought gvfs-fuse-daemon was the thing responsible for managing filesystems in userspace, but killing and restarting that doesn't help. Any other ideas?

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  • What's the best way to forward traffic on a specific port to another machine?

    - by Ankit
    The setup I have is this: [client01] <-A-> [server01] <-B-> [server02] client01 can access port 9300 on server01 (connection A). server01 can access port 9300 on server02 (connection B). What's the best way to make all traffic on port 9300 to server01 go to port 9300 on server02? I can successfully do this with an ssh tunnel from client01 to server01 to server02, but I don't want to have to run ssh on client01. When I ssh from server01 to server02 forwarding port 9300 (ssh -g -L9300:localhost:9300 server02 on server01), it doesn't work -- am I using the wrong command?

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  • Client unable to reach Internet through OpenVPN

    - by Carroarmato0
    The clients can all connect through OpenVPN. OpenVPN serves the following pool: server 10.8.0.0 255.255.255.0 I've configured the server's iptable with the following rule: iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE and echo 1 /proc/sys/net/ipv4/ip_forward This used to work back on the old vps I used. Now I've migrated to a vps which has ipv6 connectivity. Is it possible that Ipv6 has something to do with the fact that the clients can't reach the internet?

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  • I lost /dev/md2 on my server

    - by sten
    Hi, My 2 hard drives fried at the same moment apparently. My host company rebooted my server in rescue mode and I am trying to recover my data. They told me to mount /dev/sda2 to recover the data I need but, looking at a similar server that I have in pool, the data I'm looking for should be instead in /dev/md2. I can find /dev/md0 but not /dev/md2 (nor /dev/md1). I've looked on several places on the web and I could only find messages explaining how to create new partition. I just need to recover some data, not all of it and I'll be glad if anyone could help me to mount the /dev/md2 folder (or any other trick that would allow me to recover the data that was stored there). Thanks in advance, Sten

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  • What is the best time to set the IP address for a server headed to a server colocation facility?

    - by jim_m_somewhere
    What is the best time to set the IP address for a server? I have a server that I am going to install the OS on and then I am going to send it to a server colocation facility. The server is going to have Internet facing services (www, email, etc.) I can set up a "fake" IP address during install (by fake I mean private as in RFC 1918) and change the "fake" IPs to the real IPs once I set up the colocation service. The other option is to set up the colocation service...wait for them to give me the "real" IPs and use them during the OS install. The ramification are that...if I use "fake" IPs during install...I will have to wait before I set up things like SSL certs. If I wait for IPs from the colocation provider...then I can set up SSL certs that use the "correct" (as in "real") IP addresses...no changes to the certs until they expire. Do the "gotchas" of changing an IP address on a server outweigh the benefits of a quick install? The other danger with using "fake" IPs is that I could make a mistake when I go through the various files to change the IP address to the "live" IP address. Server OS: CentOS 6.2 or CentOS 6.3, 64 bit. Apps: Apache 2.4.X httpd, MySQL 5.X (will eventually use replication)

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  • How to I configure a swap partition using swapspace

    - by jcalfee314
    I finally have the swapspace project installed and running (via init.d). The purpose is to have a dynamically re-sizing swap partition. I'm clueless however on how to use it. It has good documentation but just does not go into that last step. How to I configure a swap partition using swapspace? The process is probably the same for any 3rd party program that would provide a swap space implementation to the kernel. I know this was intended to run as a process because the project provides an init.d script.

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  • Is it possible to have environment variables in the path of the working directory : PS1?

    - by mthpvg
    I am on Lubuntu and I am using bash. My PS1 (in .bashrc) is : PS1="\w> " I like it because I need to paste the working directory all the time. The problem is that the path is always very long and since I use terminator I only have half of my screen's width available to display it... it is ugly and annoying. My command prompt looks like that : /this/is/a/very/long/path/that/i/want/to/make/shorter > I'd like to set in my environment variables : $tiavl=/this/is/a/very/long And then I'll get : $tiavl/path/that/i/want/to/make/shorter > The goal is to have something shorter in the command prompt but I still want to be able to copy paste it and do : cd $tiavl/path/that/i/want/to/make/shorter It is a bit like with $HOME : ~/path/that/i/want/to/make/shorter > I know where I am and I can copy paste the ~. Thanks.

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  • Screen a running process

    - by LiraNuna
    Sometimes I forget to run a program under a screen session and can't stop it in the middle, and I know it's going to take long. Is there a way to screen an already running process without restarting it?

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  • What is the procedure to replace a failing hard drive in a RAID array?

    - by slayton
    3 years ago a co-worker setup a software RAID-6 array on Ubuntu 9.04 and I'm getting messages from the OS that the drive has bad sectors and should be replaced. I'd like to remove this drive and replace it with a new drive, however, I have never done this before and I'm terrified that in the process of fixing the array I'm going to end up ruining it. I know the device ID of the array and I know the device IDs of the individual drives in the array. Additionally I physically have the bad drive. What are the steps to replace the bad drive with a new drive and get the array running again?

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  • How can I get the comment of the current authorized_keys ssh key ?

    - by krosenvold
    Edit: What I really need to know WHICH ssh key from authorized_keys has been used to identify the currently logged on user. According to "man sshd": Protocol 2 public key consist of options, keytype, base64-encoded key, comment. I see that when I use ssh-keygen, the comment is usually the local identity of the user. Is there any way to access this value when I'm on the remote computer ? (Kind of like the SSH_CLIENT shell variable) (Assuming I enforce the comment to be a remote identity of some sort, I would like to log this from a shell-script! This is on ubuntu)

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  • how can I change the domain and name server of a image?

    - by jpganz18
    I wonder if someone did the same, I create an image of a server, then I move it to another , and that other one will have a different domain, so, now I want to create and send mail with the new domain, still the other domain is the one who signs... I already changed the dovecot.cnf , postfix, apache and hosts file, but I cant find where is that domain comming from, any idea of where to look for? Thanks!

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  • Proper way to configure ~/.Xsession with a standalone window manager to gracefully end a session

    - by cYrus
    I'm using xdm and my ~/.Xsession looks like this: # <initialization stuff here> exec openbox It works, but I've noticed that when I log out Openbox doesn't gracefully kill all the applications. In particular Google Chrome complains about that. How can I make sure to wait for all processes to exit (just like others configurations: Gnome, KDE, Windows ...)? The only (ugly) solution that I've found involves sleep and kill into ~/.Xsession.

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  • How do I enable subfolders in Dovecot?

    - by yarun can
    In the past I was able to drag and drop my folder with subfolders (local emails) into my imap accounts inside Thunderbird. Now I moved to my own vps and its running Dovecot. So far so good with emails. Today I wanted to copy some folders with messages again but I realized that it does not let me copy to folders. I can drag and drop individual emails into some folders in Imap however folders stuff does not work. I am not sure what this feature is called. The previous email servers might be using some other imap server so I am really not sure what it might be even called. Is this a Dovecot or Thundenbird thing? If it is a Dovecot feature how I enable it on my server? Dovecot is running on Debian Wheezy 64 bit vps thanks

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