Ubuntu Networking :: Internal Error Java.net.NoRouteToHostException: Network Is Unreachable?
Aug 7, 2011
I am plagued by the following error when attempting port forwarded connections to my minecraft server. Port forwarding is good and test ok on router based firewall. No iptables entries. Natty N, all updates current.
[INFO] Disconnecting CascadianNW [/184.100.247.218:57787]: Failed to verify username! [internal error java.net.NoRouteToHostException: Network is unreachable]
java.net.NoRouteToHostException: Network is unreachable
Some discussion indicate jvm network connection issues related to ipv6, but they are old posts.
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Nov 12, 2009
I recently installed Fedora 10 and I'm trying to install a driver for my HP Deskjet F4200 Series All in One printer. I downloaded the proper hplip file and when i go to install it in the terminal it gets to the very end where it is trying to install the missing required dependencies. When it checks for the network connection it comes back saying "error: The network appears to be unreachable. Installation cannot complete without access to error: distribution repositories. Please check the network and try again."I am connected to the internet through hardwire cable (also tried it through wifi) and have no trouble accessing internet through mozilla or downloading packages elsewhere. Any ideas on why my terminal won't recognize my internet connection??
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Mar 12, 2009
I installed Fedora 10 and are using KDE. I struggled to get my network up and running - error for ping was "network is unreachable". I eventually got it right by modifying my ifcfg-eth0 file manually.
Now I'm trying to install with yum, but yum fails to connect, probably because of the proxy. I've set the proxy in <System Settings><Network Settings><Proxy> but it doesn't allow me to also add the authorization - greyed out. I've chosen the manual configuration of proxy.
1. How can I enable or allow the adding of authorization in the proxy dialogs or
2. Where is the proxy file which I can modify from command line (and how)?
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May 25, 2011
I use DNS on my server as a chasing DNS so its not fully configured. I seem to be having trouble with IPV6 addresses. I'm guessing this is linked to the 6to4 tunnel I have set up to my windows box, but I'm not really sure.
Code:
May 21 18:00:16 hyrule named[1148]: error (network unreachable) resolving 'D.ROOT-SERVERS.NET/AAAA/IN': 2001:dc3::35#53
May 21 18:00:16 hyrule named[1148]: error (network unreachable) resolving 'B.ROOT-SERVERS.NET/AAAA/IN': 2001:500:1::803f:235#53
May 21 18:00:17 hyrule named[1148]: error (network unreachable) resolving 'zg.akamaitech.net/AAAA/IN': 2001:503:a83e::2:30#53 .....
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Dec 27, 2010
I've been having a lot of trouble with getting wireless networking devices to work. I guess I have a lot of company, since mfrs don't seem to be very interested in supporting Linux.It seems that one common symptom is that, when I try to "Ping" using the Terminal, I get "network is unreachable".Does this mean anything specific, or is it a general output whenever the network is not carrying on two way communications? Does it mean that the wireless interface is down? Does it mean that the wireless hardware is not transmitting? Not receiving?
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Jan 3, 2011
My ubuntu installation was running fine with the Belkin F7D1101 v1 after using this install method:[URL]..But, after allowing ubuntu to autoupdate many programs (don't remember which ones), the device stopped working. I checked all of the commands in the link above. They are all still functioning. dmesg throws no errors, but it terminates with
<code>ADDRCONF (NETDEV_UP): wlan0: link is not ready</code> Are there any network files which may have been overridden from autoupdate? iwconfig wlan0 shows "Access Point: Not-Associated" What output can I show you to help me find the problem?
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Jan 11, 2010
I've got router with: eth2 - local network (192.168.1.1), ppp0 - uplink (x.y.z.a)
my firewall:
Code:
# Generated by iptables-save v1.4.5 on Mon Jan 11 12:22:25 2010
*raw
:PREROUTING ACCEPT [1038480:666298388]
[code]....
somehow iptables -t nat -A PREROUTING -i eth2 -d x.y.z.a -j DNAT --to-destination 192.168.1.1 helps, but imho there should be some other solution. kernel is 2.6.31.6, architecture is x86_64.
P.S. i've also tried iptables -A POSTROUTING ! -d x.y.z.a -s 192.168.1.0/24 -j MASQUERADE that didn't help either.
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Mar 7, 2011
I have two linux servers, I tried to ping from one linux box to another and vice versa but error message is "connect: Network is unreachable" Where as If I tried from windows machine I am getting the reply from both the servers.
C:Documents and Settings>ping bnkprod
Pinging bnkprod.softtech.com [172.20.40.141] with 32 bytes of data:
Reply from 172.20.40.141: bytes=32 time=16ms TTL=64
Reply from 172.20.40.141: bytes=32 time<1ms TTL=64
Reply from 172.20.40.141: bytes=32 time<1ms TTL=64
Reply from 172.20.40.141: bytes=32 time<1ms TTL=64
Ping statistics for 172.20.40.141:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 16ms, Average = 4ms
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Oct 3, 2010
I have a network printer directly connected via ethernet cable to an Ubuntu netbook, but pinging the printer fails, giving "Host Unreachable". The network light on the ethernet socket is lit green, and there is nothing else cable-connected to the network - just a simple cable connection between the netbook ethernet socket and the Network printer (a HP Laserjet 4200n). Ping works fine if I plug the cable into a different machine (a Win XP box) and ping from there, so it's not a cable or IP address problem.
This sounds simple enough and should work, but I'm stumped. Clues, anyone?
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Dec 15, 2010
I'm experiencing massive latency/unreachable problems on my Linux machine. It's true for all network connections, here's an example of me trying to ping my router:
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_req=1 ttl=64 time=15115 ms
64 bytes from 192.168.0.1: icmp_req=2 ttl=64 time=14107 ms
64 bytes from 192.168.0.1: icmp_req=3 ttl=64 time=13107 ms
64 bytes from 192.168.0.1: icmp_req=4 ttl=64 time=12107 ms
64 bytes from 192.168.0.1: icmp_req=5 ttl=64 time=11108 ms
[Code]...
I've tried now with both the maverick default kernel and 2.6.37-rc5 kernel (both 64 bit), same result. If I take the card up and down (ifup, ifdown) performance is restored for a little while, then it's back. I've tried changing cable, network card and router port but no luck.
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Jan 18, 2010
I want to add this route but I am getting this error message. What is the reason of this problem? I cant add this route? how can i add?
Code: [root@linux/]# route add -net 10.1.0.0 netmask 255.255.0.0 gw 10.2.0.1 eth0 SIOCADDRT: Network is unreachable
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Jul 12, 2010
I have recently installed 10.04 on an old box I have sitting around and wanted to include it in my home network. After struggling with Network Manager I went in and set up the files manually.
/etc/hosts reads:
127.0.0.1 localhost
10.0.0.01 one.network one
10.0.0.02 two.network two
[code]....
then the IPv6 stuff
/etc/network/interfaces reads:
auto lo
iface lo inet loopback
auto eth0
[code]...
Now I can access the internet from this machine, but when I attempt to ssh to another machine in the network I get the message "Port 22 network is unreachable" Checking with google I found that there should be some ssh config files. I have one ssh_config but no sshd_config. I don't know if this is relevant. Also "network" is not the name of my network. Changed for anonymity.
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May 28, 2011
I am building a v2.6 kernel floppy disk distro to run on a 1992 computer. FWIW The specs on the computer are
* 66 MHZ processor
* 12 MB ram
* 400 MB HD
* EGA monochrome video card
It runs Linux quite nice actually. I want to get it online with a null modem cable and use the other Linux box as a gateway to the internet. I have networking, TCP and slip support in the kernel. I do now know if I have all the needed network configuration files. I am able to ping 127.0.0.1. If I try to ping the other computer, I get a "network is unreachable" error. Tell me any commands to run on either box and I will attempt to do so. Remember the old computer is running a stripped down toolset since its only two floppies worth.
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Jul 17, 2011
I installed openSUSE on one of my work system. The network port wasn't working when I was installing, but works fine now (checked in Windows). But for some reason, I am not able to configure the network. I used both Dynamic and Static IPs (both work fine in Windows) but still no go. I am using Yast Control Center for this purpose. I can't even ping the default gateway when I am using custom settings. When I use dynamic settings, it says Unreachable Network.
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Apr 27, 2010
setup my static network connection Here are my details :
IP : 172.16.152.137
Subnet : 255.255.255.192
Gateway : 172.16.152.191
Primary DNS : 172.16.0.1
[code]....
but after this setup when i restart my network #service network restart while bringing up the eth0 the following message is displayed before [OK] - RTNETLINK answers : Invalid Argument now it seems either this setup is wrong or not sufficient to set up the connection, whenever i try to ping 172.16.0.1 it showing connect : Network is Unreachable
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Oct 6, 2009
I am not too knowledgeable on networks, however I think this should be possible.I have a computer at work, which is connected to the work network. I have files stored on the central server here and also my local computer.
At this place, computer support say "We do not offer this service". However they also say "The simplest way to do what you are asking is to install an ssh server on your actual workstation".I have done this, and it the openssh server is working because I can test from my workstation by doing ssh user@hostname and it works.What I want to do however, is to connect from outside the network. Firstly, is this possible, and secondly, what is the syntax for ssh in order to do it.
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Aug 26, 2009
I have 2 live IP based Linux systems .
[Code]...
Both systems connected in same LAN based network . Both WAN live ips are connected through different modems. Problem is that , no system is able to ping or connect with other system with Live ip , though they are able to connect through LAN ip and both systes are accessable and also able to browse internet (google etc..) Ping error :-- Destination Host Unreachable.
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Jan 28, 2009
cannot ping internal network
I am a new user to Linux but in the last couple of months gained some Idea about it,I am trying to set up a small network in my office having 3 windows xp PCs, two fedora10 PCsI have an adsl router with 4-port hub connecting to the internet, one switch (say sw1) and one linux PC (say linux1) is connected directly to the router, the three win xp PCs are connected to switch sw1.all the above is working fine, I am able to get connected to Internet In all the systems, and able to network among all the above four.Now I want to make the linux1 as a proxy server for, hence I added another network card into it connected it to another switch sw2, which is connected to another linux pc (say linux2).
I have tried a hundred things, and googled an equal no. and finally posting it here.In order to reduce confusion I have disabled DHCP in all machines, and given static ips insteadNetworkManager was not happy about it, hence to fix my static IP i disabled NetworkManager ('chkconfig NetworkManager off')
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May 11, 2009
I did a new install of Kubuntu 9.04. I use static ip addresses. In an attempt to resolve the issue with the network manger in 9.04, I removed the network manager. I am now able to set the ip addresses just fine and I get to the internet. However, for some reason, I can't get to my internal router. Has anybody encountered this or have a suggestion on what I may try?
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Aug 28, 2010
I am in the process of setting up my own Linux gateway/firewall using two nics eth0(external network) and eth1(internal network). The Linux gateway hands out ip addresses using dhcp3-server, and uses iptables to route the traffic correctly. Clients are able to connect and access the internet...everything is working great, HOWEVER I can't access my apache virtual hosts websites from the internal network? They work just fine if i access them from the outside world
I can type ip of the web server, 192.168.0.201 and it shows the first virtual host listed in my /sites-enables/000-default folder. but i can't use any DNS entries. I don't have any internal DNS servers running. This doesn't makes sense, because if i replace the linux firewall/router with my normal linksys wrt54G router it works just fine.
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Jan 17, 2011
I'm have a base level understand of linux at this point. I have Debian box that I am trying to do some port redirection with.
I have my external NIC as eth0 with an IP of x.x.250.5.
I have my internal NIC as eth1 with an IP of 192.168.1.1.
On the internal network I have a NAS box with a web interface at 192.168.1.100. What I need is to set it up so that a request to x.x.250.5:8080 will some how forward/redirect to the internal network NAS box at 192.168.1.100:80.
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Feb 26, 2010
I have a question about port forwarding. I have an internal Red Hat server and I would like to use it as a central connection point to some back end servers. This is not an internet router setup. I was thinking I could use iptables and do port forwarding similar to an internet router but internal to internal.
Basically I would like to take any connections to port 22 on server1 interface eth0 and forward them out of interface eth1 to server2 port 22.I am finding a lot of information on port forwarding, but it is all based on using an internet router that is passing through to an internal server. I need to know how to configure a basic linux setup with no existing iptables entries so that I can do this within an existing network.Also, if there is a better or easier approach I would appreciate any direction. I don't want to do this through an SSH tunnel.I know to start I need the following to enable forwarding in the kernel and a firewall PREROUTING rule.
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Feb 27, 2010
I just recently installed a fresh copy of 9.10 server on an older machine I had laying around to use as a router and home server. Everything is setup and I'm on the net on it, except for some reason the Netgear GA311 I'm using for the internal network doesn't seem to be loading a driver. I've tried modprobing 8139 (which it says isn't found) as well as 8139too, 8139 too goes through ok, but it doesn't make any change, with lshw still claiming that it is "unclaimed". It seems that the Realtek chipset this card is based on is extremely compatible with Linux and I'm having trouble finding anyone with a similar issue with it.
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Jun 1, 2010
I want to ssh to a pc in our home network. It is a standard network in terms of a DSL router, dynamic IPs via DHCP, WPA2/PSK security, wireless network connection for all pcs except one which is wired to the router.I got the error "no route to host" from ssh. Openssh-server was already installed. It turned out later that the laptop I want to ssh to (namely the one which is connected by cable) cannot be pinged by any other laptop on the network.
The pc in question (lucid lynx with most recent updates) is online, can ping itself and the router, but cannot ping others in the network and cannot be pinged by them. I suspect a firewall setting of being the problem.
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Jul 13, 2010
I'm using ubuntu server 10.04. I need to create a second network to do some testing. Here's what it looks like so far: WAN > x.x.x.x/9 > router > 192.168.1.0/24 > LAN
I need to do this: WAN > x.x.x.x/9 > router > 192.168.1.0/24 > LAN > ubuntu server (LAMP, dhcp, dns via eth1) [eth0 192.168.1.138] > ubuntu server [eth1 10.0.0.1] The two networks should be transparent to one another. I've got everything working, except routing. Here is ifconfig:
[Code]...
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Dec 4, 2008
What I want is quite simple, I have my PC running Linux Mint 5 (Elyssa), and I would like to connect it to both an internal network, which has a file/print server, another machine and will soon host a small cluster. I also have a wireless router connected to the tinterweb.
The thing is using my ethernet I want to connect to the internal network whilst simultaneously using my wireless to deal with the internet, I want to keep the internal network off the net as it really doesn't need to be connected. I can connect to my internal quite happily and also my wireless but not both at once.
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Jul 3, 2010
Does anyone know if it is possible to filter/block network traffic between internal hosts on a lan?
Eg. : Linux firewall/router ( 192.168.0.1) - LAN Default G/W - all internal > external traffic gets filtered.
How would you filter tcp/ICMP/UDP traffic from internal host a ( 192.168.0.2 ) to host b ( 192.168.0.3)
All the internal hosts have the linux f/w as the default gateway, and are all on the same /24 subnet.
I would like to know if I can filter traffic between internal hosts.
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Apr 9, 2010
I have an internal network behind a server <10.0.0.1> connected to the internet that NATs my ip <10.17.11.88> only. NAT is not allowed to any other ip addresses. When I use Transmission Bittorrent client to download torrents, The thing is that this 10.20.0.244 is not my machine and doesn't have access to the internet at all. What is happening here? Can anyone help me?
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Jul 28, 2010
I have just installed CentOS and it is working fine!I made a masquerade with the document there: I didn't used the script, because right now, I do not completely understand it, and obviously I am not modifying anything by leaving it like that.I was using Mandriva before and I am used to graphical tools My questions are:I add the following lines in my iptables:
[root@localhost ~]# service iptables stop
[root@localhost ~]# iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
[root@localhost ~]# service iptables save
[code]....
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Aug 6, 2010
I will try to explain a bit first about my network typology: I have one cent os 5.5 machine with 2 nics - external one 86.x.x.122 and internal one with 2 IPs: 192.168.1.1 and 89.x.x.121. The ideea is that I have a public subnet (86.x.x.120/29) of IPs which are routable only through 86.x.x.122 so I have a webserver hosted on a different machine with the IP of 89.x.x.122 and GW 89.x.x.121 - everything works perfectly fine, except that I cannot access from the internal network 192.168.1.0 / 24 the so called DMZ (roughly) - the 89.x.x.122.
What really makes me crazy is that I setup the IPtables rules correctly because I can access the webserver from the outside world but I cannot accessit from the internal network...
what I'm missing - why the 192.168.1.0/24 cannot see the 89.x.x.122 machine... What IPtables rules should I add?
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