Tagged Questions

IP - Internet Protocol, the most commonly-used set of rules for dispatching data across a large computer network.

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0
votes
1answer
208 views

Source and Destination Packets on Wireshark Relative or Absolute?

New in Packet Analysis. Sniffing on the Ethernet device of my computer. Does the Source and Destination columns on Wireshark tell the source and destination from where the packet was originated and ...
0
votes
0answers
134 views

How to allow only a country on APF

How I can block all countries and just allow connections from IPs from Brazil to my server using APF? I've searched some ways but none are using APF at all. Some of them make me download a huge list, ...
0
votes
1answer
49 views

Can a router connect an IP network on one interface, and use one of the network's IP on the interface to the internet?

This is part of a question from a networking class. A router has IP 202.55.0.5 on the local network 202.55.0.0/21(through eth0), and uses IP address 202.55.0.6 to communicate with the internet ...
0
votes
1answer
53 views

Offloading backups to secondary network

I'm trying to solve a problem- Currently, we are constantly backing up and have no budget for additional servers. Our production network is still a 10/100 and handles voip, SQL plus our backup ...
-5
votes
1answer
26 views

Domains in local network for websites [closed]

I have installed XAMMP on my local win. server, how can i setup for every website a local domain like. "web1.lan, web2.lan, web3.local"? I already use static IP Adresses in my network...
-1
votes
1answer
2k views

Multiple IP - different gateways - one interface - Debian Squeezy

i was reading many answers here and everywhere, but I cannot find the right one. I tried several solutions, but nothing works. I have a server with ONE Interface eth0. I have multiple IP's, but I ...
20
votes
6answers
8k views

Is it possible for two hostnames share the same IP address?

Can anyone explain whether it is possible for two hostnames to share the same IP address? And what about if one hostname represents more than one IP address, is that possible too? Why?
0
votes
1answer
119 views

Forward packets on different private IPs and interface aliasing

I have a server with 2 public IPs. I configured interface aliasing to hold the second IP: # ifconfig vmbr0 Link encap:Ethernet HWaddr 4c:72:b9:4f:18:5f inet addr:public.ip.number.1 ...
1
vote
2answers
56 views

Prevent all access/IP logging in Apache2

Is it possible to configure Apache2 to prevent logging any IP addresses or other information from user web requests, essentially making all users of a site anonymous?
2
votes
2answers
71 views

Cisco Network Object NAT to get Internet?

So I've inherited a Cisco ASA 5505, and I have no experience whatsoever with the things! There are two Network Interfaces both WAN facing, and the LAN interface of course. Now in NAT rules, there are ...
-2
votes
1answer
58 views

I can not access my server by its name [closed]

I have a domain called spdserver.com I can access its control panel using IP but using "spdserver.com" doesn't work. I thought it would be name server issue but I checked my Name.com account and ...
0
votes
1answer
77 views

How to define my entire network with address range or subnet mask

I need to define my entrie network to the trusted zone. I woud like to ask, how to do this: If i have many network like: 10.30.1.1 - 10.30.1.254 10.30.2.1 - 10.30.2.254 10.30.3.1 - 10.30.3.254 ...
0
votes
1answer
139 views

On my virtual EC2 instance, what is my IP will a webpage detect if I curl it?

I have one small server on EC2. Let's say I cURL facebook.com. What IP will facebook see as the "client address"? Is it random?
-1
votes
2answers
111 views

Can I use the server ip as its fully qualified hostname?

I am setting up a dedicated mysql box, and I am not assigning any domain name to it, as it will be a backend server. Can I set its ip address as its fully qualified hostname? I am installing ...
0
votes
2answers
103 views

Why does ipv6 not specify a protocol version?

I am relatively new to dealing with network packets, but as I look into the ipv6 header formats, I do not see a place where the ipv6 headers define what protocol is used in the data section -- but the ...
3
votes
4answers
413 views

What is the proper netmask for an alias IP address?

I did a lot of searching, but there seems to be conflicting info on what the proper netmask for an aliased IP address should be. Some of the conflicting info seems to be FreeBSD-specific. I'm looking ...
-1
votes
2answers
63 views

Is there a tool to get the IP of a domain?

I have changed the A record of my domain, but now I don't know how to test if I can see the change. Is there a tool that I can use to determine the IP given a domain name, that I can use? I don't ...
1
vote
1answer
371 views

Passing Client IP across Multiple Proxies

I have a load balancer in front of an Apache httpd server, which in turn is in front of a server running Tomcat6. We're using Tomcat to running Shibboleth's IdP. The follow looks like this: Client ...
0
votes
2answers
286 views

Pinging domain names resolves but times out

Computer's IP address goes "Bad". No internet access. Local network still works fine. Can ping any other computer on the network. I can ping the DNS server. Pinging external domains resolve but time ...
0
votes
2answers
3k views

How does server handle multiple clients on the same port? Multiple sockets or multiple ports? [closed]

I have a misundertanding about some networking theory and because I couldn't find a definitive answer online (most resourceas are theory and theory etc without concise examples) I'm asking here. ...
1
vote
3answers
319 views

HP P4000 LeftHand Setup: Configure a VIP (Virtual IP)

I'm trying to setup a HP LeftHand Storage System (2x p4300) in our testlab. As I have no router (but only a Catalyst 2960-S switch) in the testlab: Is there a way to setup a VIP (Virtual IP) to ...
1
vote
1answer
412 views

Mitigate DDoS attack by Null-routing my server's IP?

My services were attacked by what appears to be a botnet of quite a large number of computers. Since all my servers have additional IPs, and my hosting provider lets me null-route my IP addresses to ...
0
votes
0answers
190 views

Quickly Filtering Blocks of IP Addresses

I had to black list some IPs that were coming from Russia from accessing my site. (Malicious bots kept taking my server down.) I created a text file that I loaded into RAM which contains /8, /16, /32, ...
-2
votes
1answer
89 views

How do I find out the internal ip address of a router in front of a firewall

We have a network with a firewall and outside of the firewall the router to connect to the isp. How do I find out what the internal ip is of that router. I do know the external ip, our fixed ip, but I ...
3
votes
1answer
219 views

Hyper-V limit IP address to guest

I have the following setup: Hyper-V host with 2 network cards (Windows 2012 core) One network card is for management only, with private IP address accessible locally. Called "Management". The other ...
0
votes
2answers
56 views

Adding an ipv6 range with dual stack [duplicate]

I have a range of ipv6 addresses available (native) and want to use them. I 've setup the kernel to support ipv6 and installed the necessary tools (iproute2 etc). I am having a problem understanding ...
0
votes
0answers
153 views

How configure Apache Virtual hosts to different IPs for outgoing connection?

I have a dedicated server with 4 IPs, Debian 7 amd64, Apache 2.2.22, PHP 5.4.4. I have configured 4 Virtualhosts, so that anyone of them listen only one IP. The problem is that all they using only one ...
0
votes
1answer
61 views

Multiple webservers behind firewall done correctly?

Basiclly I have a firewall and behind it i have a webserver which is a webportal for clients, a second webserver that hosts their webpages and a DNS server I want to route the traffic through that ...
-3
votes
1answer
173 views

automatic scanning for duplicate IPs - program needed [closed]

we need a solution to automatically scan for IP conflicts our subnet (192.168.0.x / 255.255.255.0) multiple times a day, and alert us if one is found. At the moment I use the arping program under ...
-4
votes
2answers
395 views

Prevent apache remote access [closed]

How can I disable remote access to an apache server so that the site is only accessible on my PC and not to anyone else on the internet. I want to access site via both 127.0.0.1 and my dynamic IP ...
0
votes
2answers
755 views

Cisco router configuration subnet

I am configuring a router to three different subnet as follow. Sub1: 192.168.1.1-254 255.255.248.0 Sub2: 192.168.2.1-254 255.255.248.0 Sub3: 192.168.3.1-254 255.255.248.0 In my ...
-1
votes
1answer
50 views

Recognizing when my machine has the IP of someone else [closed]

From times to times my computer is very slow in accessing internet or going to the network. Few colleagues of mine suggested that my machine might have the same IP of another one and this would cause ...
3
votes
1answer
114 views

Does IIS have a SRV _SERVICE record?

This may seem an odd question but I don't full understand SRV records. I am basically trying to point: something.example.com to and IP like 111.111.111.111:8089 I have done something similar for a ...
41
votes
5answers
3k views

Why is tampering with the TTL of IP dangerous?

I've been reading the iptables man-page (light bedtime reading) and i came across the 'TTL' target, but it warns: Setting or incrementing the TTL field can potentially be very dangerous and ...
6
votes
0answers
79 views

Why do I need to assign static ip address to the bridge and not to the physical interface? [duplicate]

I have bond0 with two physical interfaces in it. Normally I used to assign static IP address to this bond0 to set up internet connectivity on the server. Now, because of LXC virtual guests, I had to ...
1
vote
2answers
274 views

How to send mail by primary IP?

In a Debian server, I added a second IP by the following configuration in /etc/network/interfaces # The primary network interface allow-hotplug eth0 iface eth0 inet static address 1.1.1.1 ...
0
votes
2answers
152 views

Why is there a total length field in the IPv4 header? [closed]

Headers of IPv4 datagrams feature a field called total length coded on 16 bits. As there already is information about the header length of the datagram, having the total length seems redundant: it can ...
1
vote
1answer
436 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
1answer
388 views

Able to visit site from domain name but not IP address

We have our website running with IIS7, a very strange thing happened just recently. I'm able to visit the site without issue with the domain name (www._.com e.g. ), but if I actually enter the IP ...
0
votes
1answer
41 views

Unix box blocking an IP?

I have inherited a Unix box that is now running in AWS in an EC2 instance. Everything has been working fine until the other day we were doing some performance testing on the web application that is ...
1
vote
1answer
104 views

Two apache servers using same port?

so I have two apache servers on the same system. Basically what I'm trying to figure out is if since I have 2 different IPs running on my system is it possible to have two different apache servers ...
0
votes
2answers
157 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 ...
1
vote
1answer
196 views

.htaccess rules cause infinite loop

I am trying to set up some .htaccess rules to stop my WordPress wp-login.php page being accessed from anyone outside of the UK (I keep getting hundreds of people daily trying to hack into it from ...
0
votes
1answer
77 views

Why are there two types of ICMP Redirect?

Wikipedia lists 4 types of ICMP Redirect reasons: 0 Redirect for Network 1 Redirect for Host 2 Redirect for Type of Service and Network 3 Redirect for Type of Service and Host I understand ...
0
votes
1answer
188 views

how to install 2 simple ssl certificates on 2 web site having the same ip, in iis8?

how to add a second ssl certificate to the same server for two different web sites?. How to setup a second ip for the second web site considering that the server is balanced? more information: i've ...
0
votes
1answer
2k views

Do I really need to configure my server with a public static IP address?

I'm setting a few sites up and many email accounts for a new company so I wanted to save some money as I already have a server running Windows Server 2008 R2. I have a static IP of 80.229.46.115 and ...
-2
votes
1answer
76 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
2
votes
3answers
994 views

How is DHCP request message broadcasted?

The broadcast address of DHCP request message is 255.255.255.255. Will this request message go through routers? It seems to be yes as the destination address is 255.255.255.255. However, it does not ...
1
vote
1answer
467 views

How to configure Zenoss to list devices by name instead IP address automatically?

I've set Zenoss 4.2.3 to get devices from our entire network from all subnets (INFRASTRUCTURE -> DEVICES). But it returns me the device list only with the IP address, it doesn't obtain the hostnames ...
-1
votes
1answer
89 views

a special case about subnet mask calculation [duplicate]

I have an IP addresses 192.168.2.0 and a subnet 192.168.1.0/10 And I have two questions. (1) Is 192.168.1.0/10 legal? As the 9th least significant bit is not 0. And if (1) is true, does 192.168.2.0 ...