Tagged Questions
1
vote
1answer
43 views
Linux: Allow/restrict IP bind permissions by user
I'm running a dedicated machine on RHEL (CentOS 6.3) that runs with multiple IP addresses. Multiple users also have access to the machine, on non-superuser accounts. I would like to prevent them from ...
0
votes
2answers
108 views
How do know if I can SSH in servers?
I have over 200 servers, but is hard to keep tracking all of them by some documents, after a while it gets outdated, so to refresh this document, I have to know which servers I can login via SSH.
I ...
-2
votes
0answers
31 views
VPs with share ip? like share hosting? [duplicate]
I want to make a vps center to provide vps for users.I want to assign ip to vps BUT I wonder is it possible for vps centres to assign share ip to all vps? like share hosting
-2
votes
1answer
56 views
is it possible to make some vps with a single share ip using linux? [closed]
I want to make a vps center to provide vps for users.I want to assign ip to vps BUT I wonder is it possible for vps centres to assign share ip to all vps? like share hosting
0
votes
1answer
41 views
Vpn with ip alias
I'm looking for this information on google from days with no success and hope to find somebody that knows the answer here.
I have a dedicated server with a real IP configured on eth0 and a secondary ...
0
votes
1answer
90 views
Virtual network for reproducible tests
Im developing a software product that uses networking features like device bonding an multi-homing protocols. As with any protocol development, test-code needs to take latency, package-dropping etc. ...
-1
votes
1answer
66 views
understanding ip route show command on linux [closed]
I have a Windows 7 PC as host.The network details of my Windows PC are as follows.
IP ADDRESS - 192.168.1.70
DEFAULT GATEWAY - 192.168.1.254
I have installed Virtual Box ...
0
votes
0answers
55 views
How do you do IP Nullrouting
If an IP on a KVM, or OpenVZ or XEN container gets a DDoS on a VPS node, how do you nullroute that IP?
Can it be done on the host node or must you contact the data center?
0
votes
1answer
129 views
Adding static DNS entries on a dynamic BIND setup
I've got a DNS (BIND9) and DHCP (ISC-DHCP-SERVER) setup in which the DHCP server dynamically updates the DNS when hosts grab an IP address. I'm currently resubnetting a portion of my network that's ...
-1
votes
1answer
49 views
What it means by Website or Server not found [closed]
I just set up two domain names hosted by 1and1 to point to my VPS. On my VPS, I created a virtual Apache server for each. I waited a day, and then checked to see if they worked. Unfortunately, ...
1
vote
3answers
96 views
Is it possible to automatically block too frequently accessing IP addresses?
One IP address was accessing my site too frequently to be a real user, it was accessing so much that it caused site to slow down. Is there any application that can automatically block IP, if it is ...
0
votes
1answer
112 views
understanding “ip addr change” and “ip addr replace” commands
At the moment I have following IPv4 addresses associated with eth0 interface:
T60:~ # ip -V
ip utility, iproute2-ss110629
T60:~ # ip addr show dev eth0
2: eth0: ...
3
votes
1answer
139 views
ip command vs route command, what's the difference?
I see both ip and route commands used for configuring the kernel routing tables. What's the difference? It seems to me that the ip command is preferred more. Is it so, and why?
0
votes
1answer
80 views
IP logging on a Linux access point [closed]
Here I'm using my RaspberryPi as a WLAN router. It is connected to my LAN by wire (which leads to my DSL router), additionally it is equipped with a USB WLAN stick. I'm using hostapd for providing the ...
0
votes
1answer
88 views
Multiple VPN devices with the same IP
Well, this is a rather awkward inquiry and I'm pretty pessimistic about it, but lets see what the community has to say.
The scenario:
A server connecting to multiple VPN endpoints doing all sort of ...
-1
votes
1answer
104 views
Can I allow only TCP connections from inside my network, using iptables on Ubuntu?
Currently, I'm allowing all TCP connections to port 80 on my :
-A INPUT -p tcp --dport 80 -j ACCEPT
I'd like to allow all TCP connections to port 5432, but only from my local network. Is there a ...
-1
votes
2answers
131 views
VIP and private IP on same NIC
Is it possible to configure in the same NIC a VIP and a private IP (different) and both be enabled/accesible?
If yes, is there a guarantee that the communication path for these 2 IPs will be exactly ...
-1
votes
2answers
58 views
Configuring two subnets with two NICS. Access from a NAS to the internet [closed]
I am having trouble configuring my NAS. I have a DSL router with WIFI (192.168.1.1) in my flatmates room. In my room I have a server with two NICS:
1) wlan0 (192.168.1.2) that connects to the DSL ...
2
votes
2answers
93 views
Small maximum number of connections on a Linux router
I have a Linux box acting as a router with no iptables or other firewall and no networking applications running on it, just pure router. I've put it in a test environment that generates many TCP ...
0
votes
1answer
261 views
Ubuntu IP Configuration - multiple subnets & interfaces
Have a 'new' mailserver running postfix on Ubuntu.
We are having some problems configuring the subnets & interfaces.
Basically 2 subnets (.253. & .254.) need to be connected through the 3rd ...
1
vote
1answer
387 views
Linux - set an interface to not fragment packets
I am using a Linux as a router.
The machine has two NICs.
This router will be used for experiments, so I have set one of it's interfaces to have a MTU that is lower than the standard (let's decide ...
4
votes
1answer
411 views
“cat /proc/net/dev” and “ip -s link” show different statistics. Which one is lying?
I notice that /proc/net/dev says eth3 has 1753 drops. ip -s link shows 0 dropped. Why is there a difference? Where is the different data coming from? Which one is correct?
I've stripped the out extra ...
-1
votes
1answer
98 views
terminal connection from a different local IP other than the primary IP
I have ~20 public IP addresses defined on my server. Now, when I connect to a remote server via terminal, it gets connected from the primary IP of my server.
But I want to use terminal from my ...
0
votes
2answers
60 views
Execute program with another ip interface
My server has several ip interfaces. I want to execute a script that fetches a webpage content and i was wondering if its possible to use another ip interface besides the default one. The script does ...
0
votes
1answer
62 views
Forwarding from one ip to another on linux server
I have a linux server (A) which used to make several calls to another server(B) on an ip (lets say 2.2.2.2).
Now (B)'s ip (2.2.2.2) changed to (3.3.3.3) and I want for my server (A) to route all it's ...
0
votes
1answer
811 views
Change ip route metric [closed]
I'm constantly switching between eth0 and wlan0 interface on my archlinux because I often change OpenWrt fw images on my second router (which isn't connected anywhere).
So I have problem with my ...
0
votes
3answers
2k views
What is this IP address: 169.254.169.254?
I have always noticed an IP something "169.254.x.x" attached even when I am not connected to any network in my Windows operating system.
In Linux, when I list my routing table.
$ ip route show
...
-4
votes
1answer
85 views
IPv6 Address Switch
I have IPv6 addresses on a Linux based server. How can I switch the current address to a new one? Is there a way to do it using shell commands? How about using Python?
Thanks.
4
votes
1answer
447 views
Arp requests with odd source IP go unanswered
I'm having a server with network connectivity issues that I presume come from issues with arp protocol handling.
Let's say the network topology is as follows:
network 192.168.106.0, netmask ...
-3
votes
2answers
68 views
How do I change the name of my resolve host? [duplicate]
Possible Duplicate:
What is reverse DNS?
Traceroute an IP and the last entry gives me the host the IP resolved to. How do I change that?
0
votes
1answer
90 views
Finding current dynamic IP of a remote computer
I need to access a remote computer using VNC.
the computer has a static IP in its network but connects to Internet trough a VPN connection.
How can I find current IP of this computer from my own ...
-4
votes
3answers
178 views
How to see an IP's activity in Linux?
I want to isolate some possible attacker IPs. So I'm wondering how to poke to each IP's activity, assuming that web server's access log is disables?
0
votes
2answers
394 views
Linux as a gateway (no NAT)
I'm trying to configure a linux server as a gateway/router, but I can't get it to work, and all information I've managed to find is NAT-related.
I have a public IP block for the gateway and devices ...
-4
votes
2answers
89 views
how to figure out why sites on my server aren't loading
I seem to randomly receive "page cannot load, cannot connect to server" errors for sites on one of my servers. when this happens, it seems to only happen on certain IPs or IP ranges at a time. I say ...
1
vote
2answers
354 views
Multiple ip to single interface
i'm using openstack, but i think this is a more general problem. Actually i've a dedicated which comes with 1 ip address, i bought another one, and added using openstack's nova-manage cli.
So now ...
0
votes
2answers
127 views
Is Bandwidth additive?
In our small office, there are two requirements:-
A very reliable internet connection.
1> A minimum bandwidth of 4 Mbps.
2> An easy way of meeting the above two requirements is to get a Leased Line ...
0
votes
1answer
88 views
Linux NAT server with two uplinks
In linux FC9, setting eth0 has default, ping -I eth1 IP address is working fine. In FC14 tehe same does not work. The above check is done to test the connectivity from that interface so that if the ...
0
votes
1answer
524 views
IP Config resets to default settings in Linux every night
I have a linux server (centos 5) which for the past 2-3 weeks has been resetting it's ip config information to a local ip (192.168.x.x). In /etc/network/interfaces I have:
auto lo
iface lo inet ...
0
votes
0answers
130 views
What does `ec` mean in `HWaddr ec`? [closed]
When I do ifconfig on my laptop I get HWaddr ec and than an address, this is next to eth0. Note that my IPv4 address only appears next to eth1 so I assume my laptop uses the eth1 network interface.
I ...
0
votes
2answers
214 views
How to use the 2nd default IP address on Burst.net VPS?
I just bought a VPS from Burstnet. The VPS comes with two static IPs but I dont know how to use the second IP.
When I check the IP address, it always shows the first IP. How can I let it show the ...
1
vote
1answer
516 views
How do I make servers visible on my VPN?
I'm tinkering with web servers on Rackspace, trying to figure out if I can set up a website with public parts and also private parts that are visible only via a VPN connection.
I have 2 servers ...
0
votes
3answers
105 views
Need help to configure one windows and one linux server using one static ip?
I am not sure if it is possible to configure one windows server and one linux server using only on static IP address. [Note:I have two CPU's each of 2GB RAM, One modem-router and one static IP ...
0
votes
1answer
92 views
need to my server's ip changes when it needs to connect port 'x' on ip 'y' [closed]
I have a linux server and have a proxy server on another machine.
My linux server needs connect to port 'x' on ip 'y'
Is it possible to create iptables rule or another way to: when my linux server ...
2
votes
1answer
355 views
iptables preroute localhost
I would like to forward all incoming traffic from a certain port to another one using iptables. The problem is that prerouting doesn't work for traffic from localhost. This topic suggests a solution:
...
0
votes
1answer
164 views
how to get gateway address
I am trying to get gateway address but when i call "route -n" I expect to see something like that
Destination Gateway Genmask Flags
0.0.0.0 dnsip 0.0.0.0 UG ...
1
vote
1answer
187 views
How to clean up IP's and prevent “ghost hosts” from claiming their IP address?
Background
We have about 500 public IP addresses and is about to run dry. Most of the hosts are configured to get the IP from DHCP.
But there some that was configured with static IP.
The problem
...
0
votes
1answer
74 views
How to properly setup server IP?
We want to install a server in our office. Currently the server box is under 2 routers, through DMZ I succeeded to open it the world.
But we want to install DirectAdmin to the server and the problem ...
2
votes
1answer
610 views
Under what circumstances will Linux ignore the route table when choosing the MAC address for an outbound frame?
While debugging a problem with the networking configuration for a set of virtual machines running under KVM, I discovered a circumstance where the kernel in the guest VM has decided to stamp the ...
-1
votes
3answers
1k views
how to set up multiple IP addresses on my linux? [closed]
I'm doing some computer network homework and I'm supposed to develop some sort of Peer to Peer file sharing software, and when I wanna test it I need to run a few (5) instances on my linux/ubuntnu ...
0
votes
0answers
150 views
DNAT port routing trough openvpn and nat
I have an openvpn tunnel between two servers, the first one has a public static ip address and the second one is behind 2 nat. This last one has a subnet, clients are on the 192.168.15.x My vpn is ...
