Networking :: Server Only Responds To Ping Is DMZ Is Enabled For Server?
Apr 12, 2010
I have multiple public ip addresses.My DSL modem blocks ping from a server behind the modem (nb6+4w) modem lan ip (gateway) is xxx.xxx.xxx.105the server is xxx.xxx.xxx.107If I DMZ this server it responds to pings.If i don't want to use DMZ, what service is ping using.I have set up virtual server 443 to this 107 ip as it's a SSL server
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Jul 1, 2010
Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.
Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address.
When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces
Code:
auto lo
iface lo inet loopback
auto vlan100
[code]....
why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.
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May 9, 2011
Operating system: Debian Lenny 5.08 (2.6.26-2-amd64 #1 SMP Tue Jan 25 05:59:43 UTC 2011 x86_64 GNU/Linux).
I have a network iface eth0 with 2 virtual IP addresses (117.20.2.111 117.20.2.112). The virtual IP addresses I have setup by simply running:
Code:
ifconfig eth0:1 117.20.2.111 up
This has worked fine for 2 virtual IP's but the third one (117.20.2.133) will not respond to ping's though it does respond to arpping's. There are no firewall iptable rules:
Code:
iptables --list
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Output of route -n:
Code:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
117.20.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
117.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 eth0
0.0.0.0 117.20.2.1 0.0.0.0 UG 0 0 0 eth0
Output of ip rou ls:
Code:
117.20.2.0/24 dev eth0 proto kernel scope link src 117.20.2.110
117.0.0.0/8 dev eth0 proto kernel scope link src 117.20.2.111
default via 117.20.2.1 dev eth0
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Apr 29, 2010
So, I have an Virtual Machine running CentOS 5.4. It sits behind a hardware firewall which also does NAT'ing. I've set up plenty of these, so I know for sure the firewall and NAT rules are set up correctly. From the host, I can ping anything in my subnet and the gateway. But I can't ping anything else beyond the gateway. I can perform DNS queries and when I try to ping, it finds the appropriate IP address.But from the outside, I can ping the PUBLIC address (It's a 1 public to 1 private address NAT, not 1 public to multiple private). I've tried it with IPTABLES on and off, with no change.
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Nov 27, 2010
I have 2 ethernet cards but when I look at the Network configuration in "Hardware Tab" I have another acx wireless network. How to delete that because In my system Idon't have wireless card..probably installed before but want delete it now.
[code]...
then windows can ping server and resolve ip address and browsing Internet but can't ping [URL]... result is Request time out. ICMP already enabled in iptables.
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Aug 10, 2010
I have a OpenSUSE 10.1 system on my college network and I am able to ssh to other college servers, but I cannot ping these servers. More importantly than pinging when I try install one particular program it needs to be able to access one of the college servers (which has the license for it) but it is not able to contact the server.I have installed this program on other computers (windows and redhat linux) on the college network and they can connect to the server (and they can also ping the server).But Idon't know how to fix this problem.I have googled lots of things but I am a bit bamboozled.I have turned off the firewall but it doesn't make a difference.
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Jul 20, 2010
I followed this tutorial trying to set up proftpd. I'm using Slackware 13.1, but I had assumed most of the tutorial was all relevant still.Using the default proftpd.conf file, I was able to do anonymous login, but I was hoping to use the conf file in the tutorial to only allow certain users, so it currently looks like this:Quote:
# To really apply changes reload proftpd after modifications.
AllowOverwrite on
AuthAliasOnly off
[code]....
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Dec 20, 2010
I have connected my Windows XP2002 laptop with Linux 5.4 server through a direct LAN cable. I have made following configurations:
Windows:
LAN IP: 192.168.10.4
Netmask: 255.255.255.0
Gateway: 192.168.10.1
Linux:
eth0:0 IP: 192.168.10.1
eth0:1 IP: 192.168.10.3
Netmask: 255.255.255.0
route add -host 192.168.10.4 gw 192.168.10.1
I can ping the Linux server from my Windows, but cannot do so from Linux to Windows.
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Apr 5, 2010
I am building up a site-to-site OpenVPN tunnel between two locations. I am setting this up in two CentOS 5.4 boxes each containing two NIC's. I can get the tunnel up and running, and I can ping across the tunnel, however, from the client end of the tunnel I can not ping anything behind the server end of the tunnel. In other words, I can't ping anything on the server's LAN. On both servers, eth0 is the WAN side and eth1 is the LAN side.
OpenVPN server:
eth1 - 10.10.202.2/24
OpenVPN client-server:
eth1 - 192.168.204.1/24
I have IP forwarding enabled in the kernel on both machines.
Code:
[root@vpn01 openvpn]# cat /proc/sys/net/ipv4/ip_forward
[Code]...
I'm sure that the answer is right in front of me, but I can't seem to get it cleared up. I can't hit anything on the 192.168.1.0/24, 192.168.2.0/24, 10.10.4.0 or 10.10.202.0 networks from the client server.
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May 20, 2009
I have configured (bind) my server with multiple static IP. I can ping the main IP from outside but not the other IP . I can ping all the IP from localhost but not from the internet. I do not have any external firewall or blocking device. server is directly connected via modem. If anyone could advice me for why i cannot ping other Ip's
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Aug 11, 2010
I cannot ssh into an RHEL 5.5 server (192.168.20.104) from another RHEL 5.5 server (192.168.20.101) unless server debug is turned on 192.168.20.104, and even then, I have to wait several minutes before the connection is established. scp to and from the 104 server is also not working.Here is the debug output on the 101 server when server debug is not enabled on the 104 server-:
Code:
[applmgr@tclg-clone-01 ~]$ ssh -vvv 192.168.20.104
OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
[code]...
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Nov 25, 2010
I have installed Ubuntu 64 10.04 server. I have two nics and have set them up to both be static with their own IP with the correct gateway, network, broadcast, subnet and dns-nameserver. When I have both enabled, I can ping local pc's but I can't ping Internet sites like Google nor can I get out to the Internet with apt-get or Lynx.
If I disable one, then I am able to get out to the Internet. All my configs look good, and it does not matter which one I disable, just so long as there is only one NIC on, everything is good.
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Mar 17, 2010
I have a VPS running Karmic (9.10).
I can ssh it and it serves :80 (http traffic) very well.
I have followed the tutorial from here:[URL]
I would like to ask what should I do in order to get ping to that machine working? (now I can't ping it, I get timeouts)
Code:
misha@tataata:~$ sudo iptables -L
[sudo] password for misha:
Chain INPUT (policy ACCEPT)
target prot opt source destination
[Code].....
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Jan 2, 2011
I'm setting up a home network and trying to set up a Ubuntu Server (10.04) as a samba file server and a web server.I installed Ubuntu 10.04 Server and the automatic network configuration during installation failed. I've looked into host.conf, networks, interfaces, hosts and resolv.conf and either my settings are wrong or it's something else. I have a Win7 computer connected to same router and DSL modem and it works fine (edit: most of the time--- see below).
More information:
*ifconfig shows eth0 is broadcasting but without an IP address
*route shows an empty routing table
Code:
sudo route add default gw 192.168.1.254 doesn't work:
SIOCADDRT: No such process
[code]
sudo /etc/init.d/networking restart doesn't work:
[code].....
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May 28, 2011
Last night I setup bind9 on my server. I created a local domain (name.local). The server's ip address is 192.168.1.254
The issue that I'm having is that with my ubuntu laptop, I can't ping the name of the server.
Code:
user@prefect:~$ ping name.local
ping: unknown host name.local
But when I do the same ping from both the server and a XP computer, it will respond.
I can ping the laptop with it's name (prefect.name.local) from both the server and the xp computer.
This is my /etc/resolv.conf file:
Code:
user@prefect:~$ cat /etc/resolv.conf
domain name.local
search name.local
nameserver 192.168.1.254
Also, when I do nslookup name.local or dig name.local, the return with no errors.
Why is it that I can't use the name of the server to access it and that only the ip address works?
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May 7, 2010
I have installed Centos 5 on a virtual machine (esx4i). I set it to obtain an IP address from the DHCP sever, which is a broadband router, it has been given an IP address of 10.10.11.159 the router is 10.10.11.1 but I can't ping the router and I can't get any access to the network! I have a SCO Openserver server on the same physical box and it works fine so I know the network card & cable is ok.
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Feb 12, 2010
I have a script that works fine on a commercial server and my CentOs Box at home but doeasn't work with another commercial server (Where we need it to).I have pulled the PHPINFO.PHP from both and wondering if someone could tell me which parameters to compare when the following happens:The script seems to do the HTML/Java and outputs the PHP script on the page , but this site has many other PHP scripts working fine:
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Jul 11, 2011
I am trying to get a Linux (Slackware 13.37) working in a Windows networking environment. The IT support for this organisation does not extend to Linux support, so I'm limited in what help I can get for this.
I'm trying to get to the point where I can get to the internet to download what I need on this Linux machine.
The situation is this (*fictitious addresses used) -My Linux machine uses a fixed IP address (10.100.150.21)
My Windows machine uses a DHCP assigned IP address (10.100.150.213)Both Linux and Windows machine are configured to access the gateway server (10.100.150.1)So, I can ping the Linux machine from the Windows machine and vice-versa.I can ping the gateway machine from the Windows machine.I can browse Windows Shares on the network via SMB from the Linux machine.I CANNOT ping the gateway machine from the Linux machine with the Destination Host Unreachable message being the error message.
For actual internet access I need to access a proxy server but since the Linux machine can't even ping the gateway server, it fails to ping the proxy.Now, I have been told the gateway is a HW based router and for Windows machine they use some software for authentication to connect to the network. This software isn't available for Linux, so that's why I've been told to use a fixed IP address.My experience of networking is pretty basic and most of the Linux setup is done via running Slackware's setup program.
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May 4, 2011
I just remotely updated my uncle's Ubuntu 10.10 desktop to 11.04. My uncle has no computer skills, so it is very important that I troubleshoot his problems using VNC. After completing the 11.04 upgrade, I was not able to connect to him via VNC. After some fiddling around I was able to connect by turning off the confirmation option in the Security section. We are now using the password security option. The problem is that my uncle does not have any security against my peering eyes.
I tried reinstalling Vinagre, but that didn't help. Is it possible to get the confirmation option working again somehow?
Is there a download link for Vinagre 3.01 (deb)?
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Jul 22, 2011
It resides at 65.211.112.135 There are numerous domain names on this ip [URL]s Those are a few of them. Now if you try to ping 65.211.112.135 it does not respond, if you ping "www.barrierfree.us" it says pinging 65.211.112.135 but it also does not respond. BUT if you point your browser to one of the above domain names it will work, but it is quite slow.
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Mar 31, 2010
Basically, I have a windows 2003 server virtual machine (vmware) inside Ubuntu 9.10.
The Ubuntu machine has IFconfig:
Code: sam@sam-laptop:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:15:c5:b8:c8:8b
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:17
Why can't I ping or simply access the internal server on my ubuntu machine from a another computer on the 192.168.1.0 (slash)25 physical network? Do I need a bridge? Iptables?
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Jul 2, 2010
I posted it on another forum, but could not get response,So I have this cenOS, Ubuntu and windows operating system running on virtual machines.Now I gave them manual ip address, both ubuntu and windows machines can ping the default gateway, but not the CentOS.It should forward 0.0.0.0. to my cisco router address(192.168.5.254),
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Jul 18, 2011
I have a small Dell PowerEdge 1650 server with Fedora 12 loaded. We can access the internet, (Google, our home page, Etc.) but can not ping any local or outside IP addressed. Our internal computers can ping each other but not the server. No, it is not the server firewall because we also disabled it and still the same results.
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Jul 27, 2011
I run a server that is connected to several other boxes in a private network (192.168.0.0). I have had no problems previously, but upon a reinstall of Debian squeeze I have no connectivity to the private network: a ping of other addresses on that network fail. Ping and connection to outside world is fine. This box is configured similarly to another on this private network which connects successfully. I have quadruple-checked all my basic information. I post my ifconfig below of the malfunctioning device, then the ifconfig for equivalent nic on a box connected succesfully to the private network.
Questions:
1.Could it be a cable problem? (I don't see how since the cables have not been changed I do not believe since my reinstallation).
2. What about the difference in the last lines of eth1 below and eth2 of the successful box. Is it significant that the bad eth1 reads Memory:fc3a0000-fc3c0000
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Dec 9, 2010
Fresh install of 10.04.1 server; installs seamlessly; finds network no problem.
However, establishing static connection is driving me batty. Will not take. I've reconfigured "interfaces" file several times. My fingers are numb ifdown-ing and ifup-ing and /etc/init.d/network restart-ing.
I have two files in /etc/network ... interfaces and interfaces~ (one static and the other dhcp). I can switch them in and out of play. The dhcp works and pings out like a champ. static is dead, just dead. Cannot ping router ... nothing.
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Jun 4, 2010
Tried turning firewall off, i tried port forwarding tcp port 22, but it still doesn't work. Also am unable to ping modem over WAN, i can ping the modem locally though. Tech support claims pinging and ssh is not part of the internet so they wont support it in any way.
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Feb 15, 2010
I have OpenVPN running successfully on a CentOS Linux server. All remote clients connect without a problem and can ping the server LAN (10.5.0.0/24) . The server address is
10.5.0.1. All network shares on the server are available to the remote clients via SAMBA shares and this works well.The problem is that I am unable to get the remote clients to access services on the LAN clients. For example, there is a webserver running on a Windows XP PC (on the server LAN @ 10.5.0.2) with no firewall enabled. The remote VPN clients can ping this webserver at 10.5.0.2, but cannot browse the webserver at [URL]. All clients on the server LAN can however browse the webserver. The remote clients are using Windows XP and VISTA with OpenVPN 2.1.1.
I am new to VPNs and networking, but from my research, it seems as if this may be a routing issue. I would appreciate any help you may give in getting the remote clients to access the services on the LAN clients (other than the server @ 10.5.0.1).
The server configuration is:
local 192.168.10.6
port 1194
proto tcp
[code]...
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Mar 31, 2011
I am looking for the active CPU in my dell server whichl has 64 cpu's, can anyone explain me how to list the cpu which are currently active and cpu's not active, also appriciated if you could help in clarifying how to enable a cpu or disable cpu in the RHEL 5.5 environment
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Mar 20, 2009
Code...
What I can ping
Host A -> Host B
Host B -> Host A
Host A -> Router B
Host B -> Router A
Host A -> OpenVPN B
Host B -> OpenVPN A
VPN Server -> VPN Client
VPN Client -> VPN Server
What I can't ping
VPN Server to any client side host local address
VPN Client to any server side host local address
I have searched and searched for this but can not find any answers. Why can I not ping Host B from my OpenVPN server?
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Dec 21, 2010
Some time yesterday, I lost the ability to ssh my remote server, or even visit any webpages it hosts.
I've explored hosts.deny, /var/log/secure and even turned iptables off to see if it would fix anything. To no avail. Here's what my ssh login attempt looks like:
Quote:
localhost ~ $ ssh -vv x.x.x.x
OpenSSH_5.2p1, OpenSSL 0.9.8l 5 Nov 2009
debug1: Reading configuration data /etc/ssh_config
debug2: ssh_connect: needpriv 0
[Code]....
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