Ubuntu Networking :: Ufw Blocks IPv6 Connections?
Jan 10, 2011
I've just started using ufw with the frontend gufw. I've configured it like this:
Accept everything in and out as default Block incoming FTP connections from a certain IPv4 address (brute-force for days)
Today I noticed that IPv6 connections don't work anymore. The connection to two hosts (IPv6 only) times out. As soon as I disable ufw entirely, the connections work again. The host I want to connect to is:
2001:638:a00:f00b:200:1cff:fedb:d38f port 7337
2001:638:a00:f00b:a00:6ff:fe07:cda2 port 7337
These are small telnet servers that print out a number (temperature nearby) and close again. I'm logging those values in a database.
Is ufw not IPv6-capable and blocks things it's not supposed to?
Update: ufw seems complete garbage to me... You can't even configure it while it's disabled! How am I supposed to safely activate it when the first thing it does is blocking all communications? I can't even configure it to let me in before I configure it to keep me out... And then, even if I explicitly let it pass port 7337, it still blocks it through IPv6.
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Sep 18, 2009
I have seen several threads lately about slow internet connections here and elsewhere, but I haven't seen anyone post a reply about blacklisting ipv6 so I am curious as to why?Is ipv6 enabled only on certain distro's or is there some other reason that it's not mentioned?
<If anyone wants to try it, to see if it would work for them>
On Slackware 12.2 and Salix 13.0 just add "blacklist ipv6" to the /etc/modprobe.d/blacklist file. I'm not sure about non-slackware based distro's. Unfortunately, I don't know any way of doing it without rebooting.
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Jul 8, 2011
For some reason my FTP packets are blocked by iptables even though I thought I allowed them through
My syslog errors are along this line:
And my iptables ruleset:
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Jul 16, 2011
Just wonder is there any command that blocks all connections?
I am aware about RedHat #sudo /sbin/services iptables panic
and wonder is there something with similar effect in opensuse?
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Jun 18, 2010
does opensuse 11.2 come with IPv6 enabled by default? where in the gnome gui can i access these settings?
Edit-i went into the gnome network manager applet and i cant find any IPv6 settings for any of my used connections-ethernet, wireless and VPN connections all seem to only IPv4. Can anyone else confirm that opensuse 11.2 uses only IPv4 on its network connections?
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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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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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Feb 7, 2011
have a problem with my network-manager in ubuntu 10.10.when I dial one of my vpn connections, my other vpn connections be disabled and I can't use them!I tried to restart network-manager and gnome-panel, but it does't seem to solve this problem.
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Jul 23, 2010
I have wireless connection between my router and PC. It is the only computer connected. Sometimes Firestarter blocks ports 1900 and 6771 from 192.168.1.100 IP address and sometimes port 68 from 192.168.1.1 IP. I'm a bit confused because 192.168.1.100 is the IP addres i use to open ports in router and 192.168.1.1 is used to access the router settings..
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Jan 8, 2010
I have Ubuntu 9.10 installed as a dual boot on my Acer 5810T notebook. My problem is this, when I am connected to my home wifi connection (no internet, just used for printing) and to my mobile broadband (at&t tethered) neither chrome or firefox will download a web page. As soon as I disconnect from my wifi network, I can browse the internet fine. If I re-connect to my wifi network again the next time I click on a link nothing happens. Can I prioritize the connections so that the browsers look at the mobile broadband connection first?
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Aug 5, 2010
I am running the latest ubuntu. Sometimes it randomly stops accepting ssh connections, afp/smb connections, and even stops responding to pinging. It is connected via WIFI.
I go over to the desktop and use the browser, and the internet still works fine. Then after a while, it starts accepting incoming traffic again.
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Feb 24, 2011
I Installed a game server on my ubuntu desktop which is on port 7777. I can join the gameserver without any problems on my local network but when I'm trying to join using my external IP address its not working.
This is what I did:I Forwarded my port inside my router but it still didn't work.
I Removed UFW from my ubuntu machine
I Tried portforwarding with an other machine (iMac) and it's working there
Is there any Security on Ubuntu Desktop that's blocking my gameserver
I Got 2 Network cards in my Ubuntu PC
1. Is A Ethernet card that I use to connect my iMac to the Ubuntu PC (Internet Sharing on my iMac) For fast file transfers.
2. Is A WLAN card that I use to connect my Ubuntu PC to our network.
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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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Jan 7, 2010
Everytime I use Transmission for torrent download, even if I only have a single torrent, my firefox is unable to access the internet. I assume this cannot be a bandwidth problem, so what is it.
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Feb 13, 2010
When I start downloading torrent via transmission, utorrent, deluge every time I get disconnected network which can be fixed with restarting DSL modem, I've never had the problem in Win7 an WinXP.
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Nov 16, 2010
I am attempting to connect my new Brother HL-2230 printer over CUPS. However, when I try to log in to http://localhost:631/admin it asks me for authentication. When I enter the user name for my administrator account (limao) and password, it reprompts me for my username and password again. using
Code:
# lppasswd -a limao
Enter password:
[code]...
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Nov 4, 2010
I have a networking problem with my computer. Under Windows, the computer can get both v4 and v6 address via DHCP. However, the same computer can only get v4 address under Ubuntu. Does anybody know how to solve this problem?
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Apr 2, 2009
I have tried to disable the ipv6 support in ubuntu 9.04 32bit but the /etc/modprobe.d/aliases does not exist so I can't disable the suport as sugested for the previews versions. I need to disable it becouse it is pounding a total maihem in my vamware machines.
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Jul 6, 2010
some of you might have experienced the network speed problem that occurs when ipv6 is enabled. So have I. I know about the common workaround of disabling ipv6, but recently I tested the new ubuntu live system, and the problem was gone with ipv6 being enabled.
Now my question is: Do you know what ubuntu is making different? I haven't found an explanation. Is there a better workaround than blacklisting ipv6?
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May 4, 2010
I cannot connect to wirelessly when I have IPv6 enabled for the wireless network card. It works great on ethernet, but if I enable it for the wireless card then I cannot even get IPv4.
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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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Nov 15, 2010
I have a small wireless network running IPv6 connected though a 802.15.4 usb stick, and a network connection through eth1. I can access the nodes on the wireless network from my computer, but not from any other on the wired LAN. Also the nodes on the wireless cannot see even the address of eth1. I'm guessing i have to forward all packets from the wireless to eth1 in some way, but am unable to find an guides for this with IPv6.
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Feb 12, 2011
I've been using IPv6 on my local network and through a Hurricane Electric IPv6 tunnel. I've heard that one of the built in features of IPv6 is encryption, both scrambling the data and authenticating where the traffic came from. I've done some searching and heard of SWAN and Racoon, but some of the stuff I found is old and I would like to know what the easiest/best way to set up IPSEC for IPv6 is.
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Mar 10, 2011
I have just installed dyndns in my local ubuntu server runing on apache...I dont have static Ip's so I have to use ipv6 ip's how can I configure dyndns to run with ipv6 ?
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Apr 9, 2011
IPv6.google. site works, I use Teredo or something. Is there anyway to force Chromium to use always IPv6 on hosts that support it, such as xkcd?
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May 7, 2011
Anyone who's interested in playing with IPv6 should be able to do so using '6to4' - even if you're behind a NAT device! The following steps works for me on Ubuntu 11.04 (taken[URL].. 1. Make sure the 'iproute' package is installed:
Quote:
$ sudo apt-get install iproute
2. Calculate your 6to4 address:
Quote:
$ ipv4="74.125.237.49"; printf "2002:%02x%02x:%02x%02x::1" `echo $ipv4 | tr "." " "`
2002:4a7d:ed31::1
(Replace 74.125.237.49 with the public IPv4 address assigned to you by your ISP)
[Code]...
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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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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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Jun 19, 2010
I've troubles getting my new Sweex wireless 300N USB adapter to work. Tried searching in several directions (see closed thread). Further investigations shows however it is caused by the NDISGTK wrapper for Windows drivers. Can anyone tell me whether Sweex is shipping a faulty driver (it is the latest available) or it is a fault in ndisgtk? Or maybe I'm doing something stupid myself, which I do not find completely imagenary below some more detailed information on my findings: Started with network off and examined the networkstatus
Quote:
tpeelen@CC-desktop:~$ sudo lshw -C network
*-network DISABLED
description: Ethernet interface
product: RTL8111/8168B PCI Express Gigabit Ethernet controller
[code]....
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Aug 20, 2009
I have the following machine :
laptop : Dell Inspiron E1505
Wireless : Intel Pro Wireless 3945 (ipw3945-1.2.2 + ipw3945d-1.7.22 + ipw3945-ucode-1.14.2 / eth1)
Printer : HP C4580 Photosmart wireless (hplip-3.9.8)
Ethernet : Broadcom Corporation BCM4401-B0100Base-TX (b44.ko / eth0)
External Modem : Siemens CL-110 ADSL
OS : Fedora 6+11 (currently on fc6)
The external modem is connected via the laptop ethernet and provides the internet connection.
The printer is connected via wireless adhoc to the laptop's IPW3945 wireless card. I use firestarter as firewall. When firestarter is disabled everything works fine. If enabled it blocks my printer. I have tried to open every possible port via firestarter (according to several other threads) with no luck. My printer is set (under system-config-printer) as :
Code:
hp:/net/Photosmart_C4500_series?ip=192.168.2.5
$ netstat -rn .....
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