Do You Run An NTP Server For Your Network
Sep 15, 2007
I'm curious to see who here runs time services for their network / their machines. Also, if you do run time services, do you use a Stratum 0 time source (GPS, WWVB, DCF77, CDMA, et al) or do you just sync with pool.ntp.org? Is your NTP server in pool.ntp.org?
What I'm really curious to find out is if anyone here provides stratum 1 time sources (a time source that is directly sync'd to an external reference clock, like a GPS).
And have you even contemplated such a thing?
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Oct 9, 2009
I have 2 servers and want to know which one is the best one network wise.
Going by the tracert test it looks like the second one is better... is that right?
Tracing route to host.mytestserver.org [208.75.148.78]
over a maximum of 30 hops: ....
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Jun 22, 2009
problem with my server running CentOS 5.3.
I noticed that there are huge pings to my server from time to time, example:
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64 bytes from HOSTNAME (server-IP): icmp_seq=0 ttl=60 time=2.93 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=1 ttl=60 time=2.70 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=2 ttl=60 time=1901 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=3 ttl=60 time=899 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=5 ttl=60 time=2.69 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=6 ttl=60 time=2.62 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=4 ttl=60 time=2132 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=8 ttl=60 time=2.57 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=7 ttl=60 time=1190 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=10 ttl=60 time=2.65 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=9 ttl=60 time=1048 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=12 ttl=60 time=2.74 ms
64 bytes from HOSTNAME (server-IP): icmp_seq=11 ttl=60 time=1205 ms
------------------
First I thought that it is network related, but most strange for me was that I did not have any packets lose.
Then I tried to ping from my server to other hosts - situation was the same - some ping were good and some were huge (700ms, 800ms, even 2000ms)
I checked:
cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max
and it was 65536
Then I checked:
cat /proc/sys/net/ipv4/netfilter/ip_conntrack_count
and it was ~1600 so normal.
dmesg was showing such errors:
conntrack_ftp: partial 227 3331059707+13
Then I checked ifconfig, here is the output:
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eth0 Link encap:Ethernet HWaddr 00:24:21:57:2B:6F
inet addr:MAIN=IP Bcast:BCAST=IP Mask:255.255.255.192
inet6 addr: fe80::224:21ff:fe57:2b6f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:170557113 errors:0 dropped:2421127049 overruns:0 frame:0
TX packets:182047660 errors:0 dropped:46 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2756835074 (2.5 GiB) TX bytes:79640621 (75.9 MiB)
Interrupt:82 Base address:0xe000
------------------
Strange for me was:
RX packets [...] dropped:2421127049
TX packets [...] dropped:46
I did not have such dropped information on all my other servers. Dropped counter for RX was constatnly increasing.
So I decided to restart all services on the server. After restarting network and ipaliases - problem disappeared. RX dropped counter is still rising, but I do not have any slowdowns on the server and pings are normal.
My question is - does anyone could have any idea what can casue my problem and how can I prevent this in the future?
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Jan 4, 2007
I am wondering how powerful of a computer/server I'm going to need for a project for work.
The server will only be accessible over the companies LAN, it will most probably need to be running Windows, because that's what the rest of the system runs. Even though I'd rather have it Linux. The server will be running Apache, PHP, and MySQL.
It will need be accessed by around 100-200 workstations (200 on the far out side max).
They don't need to write to the database. Just read. So possibly only 1 to 2 MySQL queries per page. PHP will be of course used to generate the pages.
So how powerful of a server that's just dedicated to this would be needed?
I realize this might not be the right forum for this, but the people here are so helpful
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May 23, 2008
How does a hosting provider differentiate between network and server uptime.
In Serverpoint.com Policies I read that they offer 99.95% uptime guarantee
We guarantee that 99.95% of the time your web site will be accessible via IP address to the world.
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Jun 10, 2008
build our our server network for our business and power it with our new 15Mbps/15Mbps Fios Business Plan.
Now I know enough to set up a home network just fine but dealing with a server end is a little different.
What I need a for someone to help me with advise on hardware for our setup ie: Routers, Switches, ect ect
We are looking to start with 2 boxes at this time and may go as big as 5 so we want to be sure we have the equipment to handle it
I would like a Router that allows me to connect 2 uplink connection so if we need to upgrade we can add a 2nd fios line.
a decent router to handle this?
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Jan 19, 2014
I have have Two Apache Webserver in One Network On one Static Ip. Both Apache Severs are installed on Ubuntu 12.04.First Webserver Setup hostname apache, domain name test.com.On this web server i Run My Website,Email, And 2 Php Webapps.last night i setup a second separate(own pc) apache Server(ubuntu 12.04) as a Cloud Server.(own cloud) hostname cloud, domain name cloud.test.com..my question is how can access both server via port 80 from the world.Right now i only can access Server 1 from the web.
I nat port 80 to both static lan adresses in the network.I use (pfsense) for the router.i try to reach my Second Server with cloud.test.com
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Oct 19, 2009
For a server that use many virtual network interfaces (IP ranges) there is any posibility to find that 2 IP's from different IP ranges are pointing to same machine server?
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Jan 15, 2009
Anyone have an experiance with limestone network?
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Aug 16, 2008
I'm kind of annoyed. Not so much the server outage; I know those happen.
What is annoying me is the inability to get anyone on the phone.
I've been calling each of their 4 numbers in succession for the last 45 minutes. Finally connected with someone who has no idea what's going on, only that it is allegedly affecting their entire customer base. Man, if you're not going to answer the phone, at least put on a voice message, or maybe a banner on your Account Manager page.
their site didn't go down, just the ones they are hosting.
I'm a newbie at this so, for the vets, if you are experiencing a server outage, how long do you give your hosting company to give you an answer before getting "assertive" on the phone.
It's not a big deal to me since currently I only use my site for email. However, there must be some folks losing a bit of cash by being out of commission for an extended period of time.
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Feb 29, 2008
Can someone throw light, on how to check my Server's network speed?
I have uploaded a 200 MB dump and getting this result :
Quote:
# wget ******/dump.doc
HTTP request sent, awaiting response... 200 OK
Length: 231,816,431 [application/msword]
2% [> ]
4,984,776 1.15M/s ETA 03:22
1) How is this Dedicated Box, speed considered?
2) Any other way to test network speed?
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Oct 14, 2009
any experiences to report about purchasing used / refurb gear from either Network Liquidators (nweq.com) or Network Hardware (networkhardware.com)?
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Jul 9, 2008
I'm trying to setup a VPN server on windows 2003 standard. It suppose to work like this if configuration is correct: the server will have 20 static public IP addresses, each of my workstations will use one of the 20 IPs to connect to the server, then connect to the internet with the same IP it connects to the server. So if I do a IP lookup, each workstation will show a different public IP but the server will always assign the same IP to the same workstation.
Now all my workstations can connect to the server with any of the IPs I have, and they can surf the internet with no problems at all. However, if I do a IP lookup, every workstation shows the same pubilc IP which is totally not what I wanted. I have searched google and not much useful infor come up. Can any of the experts here help me out?
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Mar 5, 2008
I have a server with a overheating problem and a network problem.
(With a lot of users connecting to it every second)
Well, recently the server started to get slow then finally it was up on KVM but network connections do not work.
After reboot, it works for around 10+ hours but it won't last for a day as it gets slower then unconnectable.
When I look at the logs, I see this:
Mar 5 00:38:35 cn1 kernel: printk: 769 messages suppressed.
Mar 5 00:38:36 cn1 kernel: dst cache overflow
Mar 5 00:38:39 cn1 kernel: CPU0: Temperature above threshold
Mar 5 00:38:39 cn1 kernel: CPU1: Temperature above threshold
Mar 5 00:38:39 cn1 kernel: CPU1: Running in modulated clock mode
Mar 5 00:38:39 cn1 kernel: CPU0: Running in modulated clock mode
Mar 5 00:38:41 cn1 kernel: printk: 709 messages suppressed....
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Jun 12, 2007
Anyone know a network monitor software for a hosting server?
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Jun 18, 2008
I am going to setup our new database server (call it beta) in our data center. Previously we only had one server (call it alpha) which was web, email, ftp, dns, and database. Beta is taking over alphas database duties. We have a Sonicwall router/firewall as our main connection access point.
I am trying to decicde if we should simply connect alpha and beta together locally via a gigabit crossover cable, or if I should connect beta into our sonicwall router/firewall.
Beta does not need to be outside accessible at all. So if I connect beta to the sonicwall I simply would not open any ports.
What do you guys think is best for performance and the overall right way to do it.
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Mar 25, 2009
I current have a VPS hosted with a host who rent racks from Gyron.net at Telstra Londong Hosting Center Datacenter (Docklands) and im very satisfied with the network but im looking to change hosts, so im looking to find hosting companies that also rent racks/network from Gyron.net.
So does anyone knows hosting companies that rent space/racks/network from Gyron.net?
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Dec 21, 2008
What is the best linux version to run a vpn server over vps?
I'm a bit confused ,what's the best linux version if i want to have a vpn server ? Does Centos 5 work?
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Jun 28, 2008
Any security risks with setting up server on home network? I would like to set up a computer running linux or xp as a computer on our home network. We have about 3 other computers on the same network.
My network manager says that it would be a security risk to the other computers on the network if I were to have the server running on the network. The server would be connected to a netgear wireless router and I would have ports 80 and 21 opened just for the internal ip address of the server. (for example, the server is on 192.168.0.3, and I had just the two ports open for it, while there were computers on 192.168.0.2 and 192.168.0.4).
The netgear router has a firewall built into it. Each of the other computers on the network have software firewalls. I would not have a firewall on the server, and I really don't care if someone hacks it. So, what at worst could happen? Would the other computers be at risk?
If you are a professional, I want your opinion also.
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May 16, 2007
There are several methods of offering network path redundancy. The basic decision for me has come down to:
Do it at Layer 2
Do it at Layer 3
At the moment we have layer 2 redundancy to each server. 2NICs on the server up with one having the IPs for apache/mysql/etc. each nic going into a seperate switch and the switches connected together, with 2 routers running VRRP to handle the gateway.
Everything is Vlaned.
So basicaly the switch redundancy is done by spanning tree and the IP redundancy is done with a process on the router/server to move the IP to the other router/server NIC if there is an issue.
I am thinking about going with 2 fully seperate networks. in differant subnets. where each router would have a gateway. the routers would talk to each other and they would speak OSPF or ISIS with the servers. This way I would move hosting onto loopback IPs on the servers and those loopback IPs would be advertised to the both routers through seperate networks.
Again everything would be Vlanned.
This has the advantage of getting rid of spanning tree which has caused issues from time to time. It would keep redundancy up and we could standardize on the routing daemon ran on the servers allowing all of the various OSs we run to have the same basic config for network redundancy. Where now each OS tends to have its own solution. This would make life easier from a config and troubleshooting point of view.
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Jul 24, 2007
We are facing this weird problem from the past few days. Whenever we reboot the Windows 2003 Service, the server becomes inaccessible from the network or the internet after reboot. It is only after we run the sharedaccess.reg file available from http://windowsxp.mvps.org/reg/sharedaccess.reg and reboot the server, we can access the server remotely. But the same thing happens after rebooting the server again. We are also not able to start the Windows Firewall service. We get an error while trying to start the Windows Firewall Service. The screenshot of the error message is attached with this post.
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Sep 17, 2008
Is there a good dedicated server company that has fast guaranteed turn ups, allows colocation, a private network, and is outside the midwest?
I want to colo my database server(s), firewalls, and switches but then use dedicated servers as web servers. Hopefully allowing me to add web servers very quickly as needed (someone getting /.'d). I would want the webservers on a private network only.
Does anyone offer any type of service like this?
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Jan 14, 2009
Softlayer Network Issue or My server Issue?
I unable to ping softlayer.com or any external server since 14/1/2009 06:00 UTC.
I SSH into the server and
----------------
[root@server ~]# ping softlayer.com
ping: unknown host softlayer.com
[root@server ~]# nslookup softlayer.com
;; connection timed out; no servers could be reached
-----------------
My server is located at Seattle, Server Room 2
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Sep 25, 2008
I can't get access to a certain site. I always get the page with:
network time out - server at *** takes to long to respons. More people have noticed this and apparently it only happens to people with certain specific providers. And not all the time. Some times they DO get access eventy to they belong to the same ISP. So I guess an ISP isn't blocking access to it otherwise it would be permenantly/The site administrator insists that certain ISP's are blocking his site. He's hosting it on his own server. The domain belongs is registered at namecheap.com.
If an ISP is blocking this site (if that's possible?), that would lead to that 'network timeout' page wouldn't it?
What is the most likely reason for getting a timeout page anyway?
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Aug 12, 2007
i try to install a vpn server on my vps ...
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Sep 25, 2006
Okay, I have been trying to get a VPN network setup here between our DC and our office for weeks now and have not been sucessful.
Here is our goals:
-use 10.x.x.x/255.0.0.0 as a local backend network at our DC
-be able to assign a 10.x.x.x address at the office to all workstations and be able to access any of the local machines at the DC
-we have a asterisk server that we use and want to run that on the same network, asterisk box at the DC, phones at the office
We are wanting to impliment this for allot of security procedures and for ease.
But I also want to be able to have this like at my house so I can still be on the VPN. I want to have my house, office and DC always connected and then setup remote ability too to dial in via VPN.
What would be the best way to accomplish.
I have already tried having a few Linksys RV082 and WRV54G but the remote and local networks must be different networks, so this will not work here.
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Apr 5, 2009
Does anybody know how can I determine which of the IPs within the network are used or not. I know that this can be archived by pinging each of the ips but there are 256 (192.168.1.0 - 192.168.1.255). I am using CentOS 5.
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Oct 29, 2009
what do i need to build CDN Network for my video streaming site with Flash Media server using rtmpe Protocol To protect my video from Downloading?
Do you know any Company Can Build this for you for example if i order servers from them?
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Mar 4, 2007
I bought another dedicated server yesterday and it was bought online same day. It was working fine yesterday during a few site transfers but now it would appear that I am losing network packets.
I have done a traceroute and ping tests and attached are the results. Please can anyone help. I think the problem is to do with NTT's network rather than server problems but please could someone else ping from their location to confirm this.
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