Questions tagged [address]

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70 views

pfsense OpenVPN client address issue

First VPN client works like a charm (tunnel is 192.168.104.0/24 -> 192.168.104.2 assigned). But once another client logs on an identical IP is assigned. It looks there is no address pool to be defined!...
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3answers
83 views

using 192.170.130/24 as a subnet on the LAN

We have a client who has a 192.170.130/24 subnet on their LAN, which is being NATed to the WAN IP address from their ISP. Is this a good idea or should they be using an RFC1918 addresses on their LAN? ...
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1answer
53 views

Where is email delivered if the domain on a shared IP has A record but does not have MX records?

Some say that an mail server can deliver email to the IP address where the domain is pointed to by A record even if the domain does not have corresponding MX records, though it is not recommended. ...
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3answers
139 views

In IPv4 Subnets - a /23 - How do we know which range to use? [duplicate]

Let's assume I don't know what my IP range is, or my default gateway, but I know my IP address is 192.168.5.38 and my CIDR Range is /23. How do I know what my IP range is? Is my range 192.168.4.0-...
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0answers
12 views

Not allowed to use one of my sender email addresses [duplicate]

I use mail-tester.com to test my email sending health. I can't solve the issue where [SPF] mydomain.com does not allow your server 104.254.129.4 to use info@mydomain.com I have removed every single ...
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1answer
13k views

Finding the first and the last address for a given IP address [duplicate]

It is small question, but I can't figure out these things. Please help me in simply way how to do this. Consider the given ip address is 198.51.100.39/28. From this how can I found the first ,last ...
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2answers
355 views

carp single wan address

I try to put in place 2 freebsd routers with carp interfaces. since I have only one wan address, lets say : 1.2.3.4 I'd like to use private range ips to do carp jobs : 10.0.0.1(router1) alias (1.2.3....
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1answer
208 views

Why do servers not accept email address comments?

According to Wikipedia Email addresses can contain comments in parentheses like john.smith(comment)@example.com. I tried to send out some mails to valid Email addresses using such comments using ...
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1answer
122 views

Finding out the physical port number of a Network device with java

I would like to find out the physical port number (the connector itself!) of a Router where a series of devices are connected to. Finding their IP and MAC is not issue at all. Let's say, finding out ...
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1answer
521 views

Allied telesis 950 series switch , how can i see connected devices' mac adress ? mac adress table

i have Allied telesis 950/48 series switch how can i see connected devices' mac adress or mac adress table
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1answer
1k views

Map IP addresses to ports on switch? HP 2530-24G J9776A

We are trying to inventory incoming stock (used Mac computers) and are using Deploystudio and a special script. One of the conditions of the script and the database system is that each incoming ...
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1answer
430 views

Change scale set virtual network default address 10.0.0.0/16

By default, when creating a scale set through the Azure Portal, that scale set has a a virtual Network with the default address 10.0.0.0/16, even if you are already using that Network for other ...
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1answer
410 views

Primary Smtp Address valid format for New-Mailbox cmdlet

I am writing simple application that utilizes the New-Mailbox cmdlet. One of parameters that is set is PrimarySmtpAddress. Provided Smtp address must be valid, otherwise the call will fail. I was ...
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2answers
147 views

One IP address with multiple nat servers on one domain

Is it possible to use one domain to connect with servers in NAT? Example example.ltd - > 12.12.12.12 nat1.example.ltd - > 12.12.12.12 - > 192.168.1.100 nat2.example.ltd - > 12.12.12.12 - ...
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1answer
185 views

Dynamic IP address to Domain

A camera when connected to a DHCP Network receives an IP address. Using IP lookup I find the IP address of the camera. Then I type the camera IP address in a browser - it shows a website (index.html) ...
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1answer
107 views

How to find out from which switch is coming the exact MAC address

I am working on a big company with 2 Backbone routers (ARS9K) and 200+ switches (Cisco, D-link, Tp-Link and etc.). Lets say that I know an exact MAC address of a device, but I do not know to which of ...
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1answer
22k views

POSTFIX: Sender address rejected: Domain not found (in reply to MAIL FROM command)

My mail server not recognize $mydestination, why? sproxy:/var/spool/mail # tail -f /var/log/mail | grep vinicius.lehmann Oct 6 11:13:21 sproxy amavis[31008]: (31008-17) Passed CLEAN {RelayedInternal}...
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1answer
2k views

My Website Loads Really Slow Using Domain Name, But Fast Using IP

Only fixed line ISP is affected. Others OK. Anyone knows where to start to detect the problem?. DNS Checked using DIG TRACERT NSLOOKUP WHOIS all OK. is there anything i need to check at my hosting ...
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2answers
9k views

How to get public IPs on ESXi VMs?

We have a dedicated server with a hosting provider. We are running ESXi 6.0. The server has a single public IP which is currently being used for the management interface. The provider has also ...
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2answers
47k views

First and last IP address of the network 192.168.176.0/23 (subnet 23) [duplicate]

Let's have the following address of the network: 192.168.176.0/23. What are the first and last IP addresses of this network? Following this answer https://serverfault.com/a/327782/288201 I assume ...
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1answer
875 views

Is There a Way to Change the From Address in Exchange 2010 WITHOUT Using an Edge Transport?

I'm setting up some general emails for my company (info@company.com and the like), so we can print flyers and such and not worry about turnover. [I'm actually using mail-enabled Public Folders, ...
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2answers
3k views

How to disable temporary IPv6 address in win7?

I found that the IPv6 link local address was generated randomly in Windows 7, not following the EUI-64 standard. Then I found this link and followed its guide: netsh interface ipv6 set global ...
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1answer
45 views

What if you set your static IP to that of Google? [closed]

What prevents someone from setting their static IP to that of another server such as Google's servers? How is that prevented?
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1answer
45 views

Why is linux not listing the IP I want?

I have a linux based cluster (using openMosix). The machine intended to be used as a server has 2 network cards. Cluster is working, and all machines ping to each other inside the cluster (internal ...
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1answer
515 views

Postfix replaces “from” when using simple filtering

I'm trying to configure Postfix (on a RHEL 6.5) to modify the content of incoming messages and forward the emails to a remote server. I used a Perl script piped to Postfix to modify the content, and ...
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2answers
5k views

Why my website is not accessible with the www prefix

I know this is an old, and "amateur" question but I see myself in the need of making this question since I truly don't know whats going on. My website is not accessible with the www prefix... ...
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0answers
659 views

How to change SAS address on Expander

I have the following setup - two supermicro backplane attached to one controller LSI SAS 9207-4i4e and unfortunately cannot access the disks, during boot there are disks only in one backplane, the ...
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2answers
2k views

Linux Find Mac of IP address that connects to server [closed]

On Linux , How Can Find Mac of IP addreass of any user / computer that connected to server ? we use Centos + Iptables .
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2answers
27k views

What are the IPv6 Public and Private and Reserved ranges [duplicate]

I just want to know what are all the public IPv6 ranges which ISPs or other users can use? Also need a list of addresses which can be used in private networks and also the list of addresses which ...
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2answers
50 views

Session automatically resolving to secondary IP

I am using Debian 6 - 64-bit and this is what my /etc/network/interfaces file looks like auto eth0 iface eth0 inet static address PrimaryIP gateway X.X.X.X netmask 255.255.255.0 auto eth0:...
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5answers
381 views

Moved IP addresses to other server, no network internally anymore

I have had this server set-up: serverA ip 200.200.200.100 ip 200.200.200.101 ip 200.200.200.102 ip 200.200.200.103 Due to circumstances, I had to move away ip 200.200.200.102 and 200.200.200.103 ...
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1answer
393 views

How to block outgoing traffic of the mac address of one of the server's own NIC with ip tables?

i have a server with 5 nics connected to a switch, and running GNS3 (cisco router emulator). I need to block, in the server, the packets originated by the nics at layer 2 level (the nics are not ...
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1answer
96 views

How can I deny a bind lookup on a single IP address?

I am running a BIND installation as a simple RBL server. The problem I am running in to is that if I have listed a block of IP addresses like: *.0.0.10.rbl.mydomain.net. IN A 127.0....
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2answers
158 views

Assigning a static IP address to DHCP network

I would like to add a static IP address to computer on a DHCP network. If I reserve an IP address for this computer does this result in a static IP address?
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1answer
264 views

Add IP addresses on CentOS 6

I have a 12 IPv4 addresses that I need to add to a CentOS 6.3 machine however those 12 IPs are spread out among 3 different subnets. I know how to add additional IPs when they are on the same subnet, ...
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3answers
1k views

MAC Address Changed?

I was wondering if the following MAC address is a valid one? 00:13:74:00:00:00 We have an automated network registration on the system whereby users can plug in their computers and register on the ...
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2answers
143 views

Changing the IP address with a name [closed]

I have a web server (xampp) in a particular PC running on my LAN, and I added the following line in the 'hosts' file : 127.0.0.1 mysite. Then, in another PC connected to the LAN, I'm trying to ...
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1answer
1k views

Rebooting a guest causes IP address conflict

We've been having issues while setting up a vSphere cluster, using 7 ESXi hosts, and running about 74 guests that are amongst the mess. Our issue is that when we reboot a guest, Windows or Linux, ...
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1answer
2k views

Multiple IP addresses in wireshark show the same mac address. What's going on?

I'm seeing an issue with a computer (running an embedded OS) transmitting over a network to an XP embedded machine. The computer has 10 physical ethernet ports, 9 of which are on this network. I ...
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2answers
805 views

Local Network Windows Port Address Translation

We have many legacy applications that can only send reports via printing. We have an application called RPM that can receive these print jobs and convert them to a more useful medium (e.g. PDF ...
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2answers
1k views

Getting IP addresses through sniffing [closed]

Is it possible to know the gateway address of a wireless AP that I'm not connected to through sniffing? Airodump-ng can show MAC addresses of the AP and the clients associated but doesn't show IP ...
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2answers
56 views

Setting http://domain and http://ip to show different directories

Can someone tell me what httpd.conf settings I need to acomplish this? When in browser I access http://IP I want to show: /var/www/html/ And when I access http://domain I want to show /var/www/html/...
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1answer
578 views

How to enable DHCP address release with dhclient

We have a subnet with a couple of hundred virtual machines that: boot up do some short heavy computational task and shut down. The average life of a vm here is about 20 minutes. It's critical that ...
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1answer
775 views

Postfix connection cache / address verification probes

Is Postfix connection cache also applicable for address verification probes? My setup of 2 frontends with 1 backend sometimes runs into trouble under high load. Frontends verify recipients on the ...
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3answers
20k views

IP address of virtual server?

I have a virtual server (shared hosting), with a domain name (and several sub-accounts, each one a separate site also with its own domain name) I was wondering if there was a way to find out the IP ...
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3answers
4k views

CentOS Wrong Outgoing IP Address

I have a Centos 5 box with a sub interface: ifconfig eth0 10.1.1.1 255.255.255.255 ifconfig eth0:1 10.1.1.2 255.255.255.255 The netmasks need to be 32bit in the environment this server is in. So in ...
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2answers
2k views

Outbound IPv6 Trafic Fails

My hosting provider has supplied me with global static IPv6 for my machine. It appears that auto configuration has been successful and I can successfully ping my machine and tracepath6 appears to ...
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2answers
6k views

Allowing traffic only from a specified IP addresses using iptables

I have a dedicated server (which I only use a lab/testing environment). On the server CentOS 5.6 is running and it is functioning as a KVM host. To secure things a little I want to do the following ...
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5answers
4k views

Why is this China IP hitting my web site?

I have a web site that uses a couple hundred domain aliases, including franchise-dallas.info, franchise-delaware.info, and detroitfranchise.info (see more below). I have been getting ten to twenty ...
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1answer
769 views

configuring external block of IP addresses

I have a business DSL through FairPoint. With it, I have a block of 5 IP addresses. I've done some googling and spoken with FP tech support. Perhaps someone that's more knowledgeable than I can ...