I have a Dell EMC Unity 300 shared storage for my 2 servers.
I have a problem where I can not be able to get SP-a and SP-b IP addresses for the storage, which is essential in helping me create my LUNs.
I can only get the storage management IP address which I have tried to ping from my server but it throws an error of “Destination Host Unreachable”.
All cables are well plugged in.
Further investigations using the Dell SP LED status indicators, below was observed from the SP fault LED:
I would like to solve this issue so that I can ping the storage IPs and hence log in to the storage.
Please help with your expertise, thoughts, possible solutions and ideas if you have seen this before.
Related
My internet is only working for heavily cached sites. Reddit, Gmail, Facebook, etc. The odd thing is, sites like Reddit make queries to non-reddit sites to import the images and they pop up fine when viewing from there, but when I get sent to out.reddit.com and then if I go elsewhere to other non-heavily cached sites, I get timed out connection error.
I can't even visit SpeedTest.net because it times out. I also can't even post a question on StackExchange because of it. What could possibly be going on and how to I debug?
EDIT: I had an inclination that it had to do with Docker. I removed all traces using a powershell script and through remove programs and still didn't work.
user3654055 are friends IRL and we debugged this in person.
It's always best to start from layer 1 and work our way up.
user3654055's computer could connect to wireless networks. This tells us layers 1 and 2 are working
.
user3654055's computer received a DHCP lease. Further testing of layer 3 showed inconsistent results with pinging local IP addresses.
I ran route print to print all routes. This produced a huge amount of output.
Normal output for a Windows computer connected to a flat LAN should produce perhaps 3 routes.
user3654055 had recently installed Docker and attempted to set up a private
internal network for the containers on their PC.
user3654055 had created two virtual networks (one internal vEthernet switch, one external vEthernet switch), a NAT interface, and bridged the wireless adapter to one of those interfaces and had not set up routing correctly for any traffic.
This produced the above scenario where certain traffic was routed correctly or hit the cache and the page would load, but most traffic was routed incorrectly and resulted in a timeout.
Disabling all the vEthernet switches and the NAT interface and removing the wireless adapter from the bridge let the user use their wireless card again.
The above configuration could work if the user set up routing correctly by hand, but we can save that for a later date.
Sounds like a DNS issue...do you know what you are using as a DNS address? You could try using Google's which is 8.8.8.8 for primary and 8.8.4.4 for secondary. Failing that does it get better following a router reboot?
To debug your internet connection, I would at first check what happens with tracert.
Traceroute command shows you the path taken by your packets and its latency from hop to hop.
From console (linux) or from cmd (windows)
tracert stackoverflow.com
this shows you where you are lagging, the first entry may be your router IP. If the first entry appears with high latency try to reboot your router.
Checking for DNS Issues
Try to use nslookup. This is what you should get:
nslookup stackoverflow.com
Server: UnKnown
Address: 192.168.1.1
Risposta da un server non autorevole: //italian comment
Nome: stackoverflow.com.home
Address: 54.72.52.58
if this fails or replies with high latency try to change your DNS to Google DNS.
Primary DNS: 8.8.8.8
Secondary DNS: 8.8.4.4
I am new to Data Distributive Service.I am using PrismTech products for DDS. I have vortex lite in my network. To interact with the vortex gateway in public cloud , i am using vortex fog service. But was not able to establish interaction. Can any one please provide input for the same.
I have a DDS subsystem running on my network , data from it needs to be shared to the vortex gateway running in the cloud, for this purpose i am try to use Vortex fog . IN vortex fog configuration i have mentioned the public ip of the cloud server. I have a vortex gateway subscriber job running in the cloud to receive the dds data from the subsystem running in my network.
Fog service is running in the LAN behind the NAT . I had set below configurations for running fog service
fog.cluster.id=LAN1
fog.user.network.interface=eth1
fog.routing.network.interface=eth1
fog.services.network.interface=eth1
fog.services.tcp.peers=<public ip of cloud server>:7400
fog.externalNetworkAddresses=none
In cloud server i am running the vortex gateway subscribing to different topics.
Could you please correct/guide me to solve this issue
It is hard to give you a concrete answer as I don't have the details of your configuration. That said, let me try to give you some hint that may guide you toward the resolution of your problem.
Are there any applications subscribing for data on the Cloud? Notice that in Vortex data only flows if there is an interest arising. Otherwise no data is sent across the network -- that would just be a waste of precious resources. Beware that even if you have applications sharing data within a Fog but no applications subscribing to data "outside" the Fog, data won't be pushed out by Vortex-Fog. Once again, data flows only where there is an interest.
I assume that you are using Fog because you have an entire sub-system, i.e. several DDS applications, whose data needs to be efficiently shared with the cloud while maintaining multicast communication on the sub-system. If this is not the case, then you can simply configure Lite and the Gateway to use TCP/IP and have them talk directly. That would probably be the simplest deployment.
To ensure that you don't have any specific problems with your network set-up have you tried to run two Lite applications that use TCP/IP and communicate through our public Vortex Cloud instance available at demo-eu.prismtech.com or demo-us.prismtech.com?
If you post your configuration files I may be able to give you more insights.
HTH.
A+
I'm using CocoaAsyncSocket for a server client application on the iPad. Right now if the server is up the client can type in the IP of the server and connect to it. Is there a way to display all the servers on the local network that are running this app?
Thanks!
Looking up devices in own network is easily realized by using zeroconf/bonjour service.
The servers have to run the service and tell the service-name. This can be filtered by the client app.
I cannot promise, but maybe you find something usefull in my question times ago: Clean solution for lookup if extern IP is in own subnet range in objective-c (care, this code will not compile for arm64 architecture and has to be reworked)
Looking at this related SO question, I can't help but wonder about the uniqueness of MAC addresses.
How unique are MAC addresses?
I'm using them to semi-uniquely identify users. I have a website that users of virtually any device (PC, Mac, iPhone, Android phone, etc.) and any OS can hit via an HTTP request. I use a combination of IP address and MAC address to identify unique users.
I assume the following cases can exist:
A device has no MAC address (unlikely, sure, but anyway)
A device has a unique MAC address
A device has multiple unique MAC addresses
Two or more devices have the same MAC address
The first three of these cases are unique (the third because I only need a single unique MAC address). For the fourth case, how likely is this?
That is: given 100 random users (perhaps Windows users for any Windows OS), how many of them can I expect to have the same MAC address? Is it just generally because of the limited length of MAC addresses? Or is it dependent on some sort of purposeful configuration change (MAC address spoofing)?
I'm okay with MAC addresses being semi-unique, I just want some clarity on how to interpret the data.
(I'm using the C# code against .NET 2.0 in the linked question against .NET 2.0.)
This is only true on the same network.
MAC addresses are resolved locally using ARP to route local packets at a hardware level. ARP is not a routable protocol and is not resolved across subnets.
If your webserver is behind a router with port mapping and all the incoming traffic to it is coming from that router, then every connection will appear to come from the MAC address of the router, you won't 'see' the MAC address of the original machine, not unless you can pick it up with a web page somehow (i'm not a web genius so don't ask me on that one, but Im guessing you'd need some heavy lifting at the client end with Java, or some other kind of active component to interrogate the local machine, easier to use a cookie)
You can find out the Public IP address of the remote machine where the outgoing NAT took place, but once again, there could be multiple device connecting from behind a router which would limit the usefulness of this method, and it means need to look into IP packets, which I have no idea how you can do that from a web server (probably can't?).
Anyway, this is what cookies are for, a way of leaving an identifier on a remote machine so you can see where traffic came from. If people don't accept cookies, unless you start getting very very creative you aren't going to be able to uniquely identify them.
(BTW Mac address are always unique (ok, you can occasionally find a reused MAC, but its extremely rare, or at least needs to be for networking to work!), thats the purpose of them, it's just not much help in this scenario if you are not on the same network)
100 random users (perhaps Windows users for any Windows OS), how many
of them can I expect to have the same MAC address?
Zero. And when they are in the same network, they could not communicate with the same MAC-Address, since Ethernet uses them to find the Computer. They are pretty unique. Producers of network cards get ranges of addresses they may assign to their products.
But: There are ways to manipulate your MAC Address, and there are scenarios where people do just that! For example when you want to enter a network, which is restricted to certain MAC-Addresses, you can manipulate your own to match one of those (if you find out, which ones are on the whitelist). Since I don't know, what your szenario is, (what you wnat to accomplish), I can not tell you if that is relevant for yout.
You just need to understand the difference between a MAC Address (that can be changed) and the identifier of your hardware [your Network Interface Controler to be precise] (that is forever assigned by its the manufacturer).
MAC address is the name of your device when it connects to the internet (through a rooter or a switch). You can change your MAC Address, but by default, this ID uses the identifier assigned by the manufacturer of the network interface controller (NIC) (e.g. your Wifi antena)
Exemple: I've changed my MAC address for my two computers using the same MAC Address: 00:01:02:03:04:06. My computers seems to be the same when connected to the same router but the identifier of their wifi antena remain unchanged and different.
I have a delphi application (made in delphi 7) using the indy components. I can connect them both locally and they both transfer data just fine etc. Now I would like to host my delphi application on a server over the internet. What would be required to do this? What kind of server would I need and how would they connect to each other?
Your question seems to have nothing to do with Indy or Delphi at all.
To connect to a server on the internet, you need a server on the internet. That is to say, you would need a PC running windows, that has a publically available IP address, or one of the following:
A VPN that allows you to dial in to a private network. A Vpn would provide you with a lot more security than you would get putting your windows PC/server machine directly onto the internet with a public IP.
A hosted machine, somewhere with a fast internet connection, usually located at an ISP (called co-location), or a "cloud instance" (a virtual machine hosted by a major "cloud hosting" provider such as Amazon EC2 or Windows Azure). Note that Delphi XE has some special features for working with Cloud computing (Azure and Amazon). You can get such services all over the place and then you will have a server machine with a fast internet connection, which you can do whatever you want with, including installing your server software. This costs money, of course.
Make sure the server PC is exposed on the Internet so that the client PC can see it, and the client and server software should work exactly like they do when running on the same PC.
If your server computer has a non routable IP address that can't be seen from the Internet, you will have to get some help from your router. For example, have any connect requests on a certain port redirected to the internal IP address of your server PC.