How do packet losses affect running of a website, say i get packet loss for some site like around 30-40% but can still browse their websites, so how do packet losses affect working of a website ?
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today i got a email form my web hosting:
"Lunarpages Web Hosting is scheduled to undergo maintenance this Saturday, January 17, 2009, at our San Diego location in order to upgrade our internal systems to be more energy efficient in our power usage, a major step in our initiative to Go Green in 2009. Unfortunately, this means that some of our servers will be unavailable for a short time while we upgrade these systems. We apologize for any inconvenience this may cause.
Below, you will find information on how to track the progress of our upgrades and the scheduled times that our servers will be undergoing these improvements.
The following times are our three scheduled maintenance windows for this upgrade. Please note that the information is in Pacific Standard Time (PST):
* Saturday, January 17, 7am-10am
* Saturday, January 17, 10am-1pm
* Saturday, January 17, 6pm-9pm
"
will this maintenance affect the rank of my website in google and other search engine?
If I change hosts, will that affect my google pagerank?
View 5 Replies View RelatedI would liek to know if changing the hosting server affect the PR or the indexing for my current sites?
View 10 Replies View Relatedi have a server with whm/cpanel,
i use the "Apache Update" to compile the php4Aphp5 of the server,
and i set the "PHP 5 Handler" as cgi,
some account tell me his php script can not login any more,
i want to ask,if i changing to cgi will affect it?
if yes, how can i solve it?
I have ever made a DNS Server change and I was curious how this is going to affect my e-mail.
Lets say this is my URL - www.testURL.com
I also have my e-mail setup as MyName@testURL.com
I now have a new host so we are going to change the DNS settings so www.testURL.com now points to the new web host. Is this going to affect my e-mail address MyName@testURL.com or do I also have to make a request to get the e-mail changed as well?
I set up my own webserver earlier this year using a dedicated server from my hosting company (IIS, win2003), for some reason two of my websites on there are not being listed by Google (or any search engine) at all. Could there be something wrong in my setup that can cause this to happen?
View 3 Replies View Relatedour company is ordering a new dedicated server and we are a little unsure what we should choose as far as the full hostname and nameservers of this one server.
This server will have a couple different websites on it, but really, there is only one BIG website on it... let's call it abcd.com.
While most would pick a hostname of host.abcd.com for instance, if at all possible, we would like the domain name part of the hostname to be something different than abcd.com. We own a domain name that doesn't point to anything yet (unuseddomain.com) and we were wondering if we could use that domain in our hostname.. host.unuseddomain.com.
And instead of using abcd.com as the domain name for our own nameservers (ie. ns1.abcd.com, ns2.abcd.com), we would like to again, use the unused domain name we own (unuseddomain.com) for the nameservers domain name: ns1.unuseddomain.com, ns2.unuseddomain.com.
So...
Will this work? Is this perfectly acceptable?
And lastly...
Since the one website we really care about on this server (the one we got the server for in the first place) is abcd.com, is using the unuseddomain.com for the hostname and nameservers (as above) a bad choice in anyway regarding email deliverability? I understand that mail ISP's (hotmail, yahoo, etc.) do all kinds of checks on hostnames (PTR), etc... and we want to make sure that we aren't hurting ourselves in anyway by using an "empty" domain name that we own as our hostname's and nameserver's domain name.
For instance, if we send mail from the abcd.com account, it will use mail.abcd.com (1.1.1.1) as it's outgoing mail server... Hotmail will see this... do a reverse-dns lookup on 1.1.1.1 and see host.unuseddomain.com. See what I'm saying? It all will work, but will it toss up red flags?
I am just wondering if the Global financial crisis has any negative impacts on hosting providers and IT sector? Do the crisis consequences lead to hosting sales decrease? How does the World hosting industry experience financial crisis? How can hosting business owners comment the current situation in the World?
View 14 Replies View RelatedI am considering a server from Iweb wich is based in Canada.
My question is about search engines especially google. My site will be targeting US visitors and I am in the US. When google and other search engines see that my IP address is in Canada will it have any affect on search engine ranking for the regular us google.com? I don't care much about rankings on google.ca since my visitors will mainly be in the USA. anybody have any insite on this? I also want to mention my domain name will be a .com domain
I have seen 1 vps provider having very poor ping results in few online ping sites and they have a very cluster slow loading pages as well.
One of my friend has a package with them, the ping results are very poor even for him as well. Just made an traceroute found its on some node1.vpsprovider.com
Ya, one more major important similarity noticed was, the vps provider emails weren't set properly to yahoo mail, and my friend's emails sent from the server to yahoo weren't delivered as well.
So if the vps provider has poor content may be due to firewall or internal settings do the systems under the node also be affected?
I have no problems with my host so nothing to be worried about, but need to help him as he is just starting it out with a cheaper vps
I have maindomain.com addon-1.com addon-2.com addon-3.com
The addon domains are folders in main domain's root.
The problem is maindomain's htaccess is affecting the addon domains. I want the add on domains to have their own htaccess. The addon domains should not be influenced by main domain's htaccess
I did some research online and someone says this method works:
Code:
RewriteCond %{HTTP_HOST} ^(www.)?addon_domain.com
RewriteRule .* - [L]
But the above assumes you only have one addon domain. I have multiple.
Which code is correct? This
Code:
RewriteCond %{HTTP_HOST} ^(www.)?addon-1.com
RewriteRule .* - [L]
RewriteCond %{HTTP_HOST} ^(www.)?addon-2.com
RewriteRule .* - [L]
RewriteCond %{HTTP_HOST} ^(www.)?addon-3.com
RewriteRule .* - [L]
Or this
Code:
RewriteCond %{HTTP_HOST} ^(www.)?addon-1.com
RewriteCond %{HTTP_HOST} ^(www.)?addon-2.com
RewriteCond %{HTTP_HOST} ^(www.)?addon-3.com
RewriteRule .* - [L]
do I put the code at the beginning of main domain's htaccess?
Just have a question for everyone. Does having a Dedicated IP on your shared service affect your purchase decision?
(i.e., When searching for Shared Web Hosting, do you make it a requirement that you get assigned your own Unique IP or do you not care if you are assigned the Main Box IP.)
I am noticing some packet loss on one of my boxes, most notably when i'm accessing the webmail (however i'm pretty sure it's not that)
Can anyone offer some tips as to how to nail this down?
I have been faced with a packet flooding issue.
Quick scenario, I run a few public game servers, and we have had a member go insane.
This member has been using a piece of software, to do a simple DDoS attack, and when they perform this attack, it laggs everybody out, and takes down the individual game server.
While this is occurring, I have been watching with a network analyzer program, and noticed the packets go sky high (from 4.4k to 150k+).
So, I am in need of a quick, piece of software that can block flood attacks, or whatever is going on.
I have a dedicated windows 2003 server at a colocation facility that i use for game server hosting. Over the past 7 months, packet loss has become horrible with random periods of massive lag. My host says it's something on my end. I use a firewall with SPI enabled. Could that be causing it?
Strange thing is, the first few months my server was at that colo, they only had around 40 other servers on a single OC-192 pipe and i never had packet loss despite having the same SPI firewall. But now they have over 300 servers on the same OC-192 pipe. Could the packet loss be caused by my SPI firewall or them overloading the network with servers?
In an environment where there is no webmail enabled for hosted sites and no sites have registered names (eg; they all belong in "our name space"), what is the affect of NAMED not running?
One affect that I have seen is with Site Scheduled Tasks that need URL resolutions. This appears to fail if Named is not running. All OTHER site content seems to work just fine. Apparently even in WordPress Multi-user/site situations.
I FULLY understand bind/named (and /etc/hosts, /etc/resolv.conf, /etc/nsswitch.conf), but it seems that it some cases, virtual hosted sites do not need Named (active) to function. This is NOT a case of incorrect DNS definitions created by Plesk for any hosted site.
SO - what is the "affect" of Named NOT running in a PLesk-12 Linux environment - not only for hosted sites but also the Plesk server itself?
We have a license application client(IBM/LUM) that connects to a license server outside our network.
The clients works this way... it binds a random port and tries to connect to the remote IP with UDP port 1515.
Through wireshark I could see that it reaches the destionation, although the way back is unreachable.
If I add this random port to our router Port Forward rule, it works perfectly. Although this is not a solution cause the port is changing every time.
Isnt this strange? Other applications open random ports as well and comunication is two-way reachable.
If I connect directly to the internet, it works perfectly as well.
What can I try to do with our ZyWall USG300 Router to fix this situation?
Basically I registered with a new host. They sent me the details with obviously includes the IP address. I tested the IP address on just-ping.com and it came back with all of them having between 80% to 100% packet loss. Surely this is not normal is it? I havent moved my domain yet but it doesnt look good does it? Should I cancel?
View 14 Replies View RelatedI restored a database and got this error:
ERROR 1153 (08S01) at line 2663: Got a packet bigger than
'max_allowed_packet' bytes
why I got this error and how to fix this? vbulletin staff told me that I have to increase the 'max_allowed_packet' in my.cnf, then restart MySQL. Where can I find this file? I use Directadmin control panel for my dedicate server.
Anyone else experiencing packet loss with a GoDaddy VDS?
I'm in the 208.109.93 subnet.
--- google.com ping statistics ---
200 packets transmitted, 53 received, 73% packet loss, time 199086ms
rtt min/avg/max/mdev = 41.970/42.813/46.022/0.994 ms
with two 3com 3870 switches.
Our setup looks like this
Computer A (GigE) Switch 1 (gigE) Media Converter (Fiber Run) Media Converter (gigE) Switch 2 (gigE) Computer B
We have a cross connect in our data center that uses media converters (fiber) to regular 1000FD on each end.
Each end of the 1000FD handoff is plugged into port 1 of the 3870's (switch 1 and switch 2).
Pinging from Computer A to Computer B we receive a 50% packet loss.
Pinging from Computer B to Switch 1, no packet loss.
Pinging from Computer A to Switch 2, 50% packet loss.
Looking in the interface, the port 1's on each switch auto negotiate to 1000FD, however flow control shows as off.
We asked our data center to run tests on the media converts and fiber runs and everything comes back 100% fine. Has anyone seen a weird issue like this before with 3com switches not playing nicely with media converters?
I have no clue whats going on and our data center said the fiber run/media converter is fine... [url]
I having having issue with few of my servers sending Reset packet to a particular IP. I have disabled my firewall and noticed that few machines (Unix/Windows) is still sending Reset package to one IP only. Reset packet will be sent over on all ports except icmp ping.
Anybody know where to check? Or the server on the other IP is having problem which cause my servers to send the Reset packet
I have smokeping monitoring my game servers and so far in the little time that it has been running all my game servers have been encountering an average of 4 to 10% packet loss. Are there are tweaks i can run on the server computer to reduce packet loss? (registry modifications, etc.)
I downloaded a TCP tweak program called "TCP Optimizer" is it safe to run on a Windows 2003 Server OS?
The colo connection is an OC 192 and i have a 100Mbit ethernet card.
Here are my current TCP settings:
Quote:
[SYSTEMCurrentControlSetServicesTcpipParameters]
TcpWindowSize=-1
GlobalMaxTcpWindowSize=-1
EnablePMTUDiscovery=-1
EnablePMTUBHDetect=-1
SackOpts=-1
DefaultTTL=-1
TcpMaxDupAcks=-1
Tcp1323Opts=-1
DisableUserTOSSetting=-1
DefaultTOSValue=-1
[SYSTEMCurrentControlSetServicesAfdParameters]
DefaultReceiveWindow=-1
[SoftwareMicrosoftWindowsCurrentVersionInternet Settings]
MaxConnectionsPerServer=-1
MaxConnectionsPer1_0Server=-1
[SYSTEMCurrentControlSetServicesICSharingSettingsGeneral]
InternetMTU=-1
[SOFTWAREMicrosoftWindowsCurrentVersionExplorerRemoteComputerNameSpace{D6277990-4C6A-11CF-8D87-00AA0060F5BF}]
{D6277990-4C6A-11CF-8D87-00AA0060F5BF}=-1
[SYSTEMCurrentControlSetServicesDnscacheParameters]
MaxNegativeCacheTtl=-1
NegativeCacheTime=-1
NetFailureCacheTime=-1
NegativeSOACacheTime=-1
[SOFTWAREPoliciesMicrosoftWindowsPsched]
NonBestEffortLimit=-5
[SYSTEMCurrentControlSetServicesTcpipServiceProvider]
LocalPriority=499
HostsPriority=500
DnsPriority=2000
NetbtPriority=2001
[SystemCurrentControlSetServicesLanmanServerParameters]
SizReqBuf=-1
[SYSTEMCurrentControlSetServicesNdisWanParametersProtocols]
ProtocolMTU=-2
[SYSTEMCurrentControlSetServicesTcpipParametersInterfaces{D63AC0FA-D2C9-4D83-B057-31A353516AB3}]
MTU=-1
TcpWindowSize=-1
[SYSTEMCurrentControlSetServicesPschedParametersAdapters{D63AC0FA-D2C9-4D83-B057-31A353516AB3}]
NonBestEffortLimit=-2
[SYSTEMCurrentControlSetServicesTcpipParametersInterfaces{8190D94A-3B2D-45C4-998D-312E99D6061D}]
MTU=-1
TcpWindowSize=-1
[SYSTEMCurrentControlSetServicesPschedParametersAdapters{8190D94A-3B2D-45C4-998D-312E99D6061D}]
NonBestEffortLimit=-2
How to check in Unix machine? My server is sending a Reset packet to the specific IP.
View 6 Replies View RelatedI have a home CentOS server and here is my issue
When I try to connect to it via SSH its laggy and often times out. I also notice packet loss.
My home network is 100 Mbps and the router is a crappy netgear WPN824 V3
Recently I have been having this problem with two high traffic servers on two different network.
Both servers are Quad-Core Xeons with CentOS 4.5 x86_64 and they are on 100mbps full duplex network. Software configuration is Nginx+Apache+MYSQL control panel is Directadmin.
The servers are serving lots static files and some php scripts.
When the servers start push near or over 30mbps, there will be packet loss when I ping them. around 5% loss, push more bandwidth the more packet loss. I have checked all the log files, I don't see any unusual errors.
Server Load is fine. The NICs were on 100mbps full-duplex mode.
The datacenters claim the networks were fine and all the other servers running on the same switches were fine with no packet loss.
I'm trying to find out why a single interface is causing packet loss on my entire network.
The network consists of four 2924's trunked to a 3550. I have about 20 vlans and a single default route for all traffic my uplink.
The network is perfect until I enable a single server. After I issue a 'no shut' on the interface packet loss is anywhere from 5% to 20% for anything going through the 3550 or even pings from the 3550 to other switches or the uplink.
Here's the statistics/settings of the interface after 1 minute of activity:
Code:
interface FastEthernet0/1
description 228
switchport access vlan 58
switchport mode dynamic desirable
speed 100
duplex full
spanning-tree portfast
FastEthernet0/1 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0014.f2e6.df01 (bia 0014.f2e6.df01)
Description: 228
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 6/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:01:01
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 2536000 bits/sec, 924 packets/sec
5 minute output rate 341000 bits/sec, 469 packets/sec
60922 packets input, 21630544 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 2 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
31585 packets output, 2859788 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
Transmit FastEthernet0/1 Receive
3583183 Bytes 27018085 Bytes
39516 Unicast frames 76403 Unicast frames
46 Multicast frames 0 Multicast frames
0 Broadcast frames 0 Broadcast frames
0 Discarded frames 0 No dest, unicast
0 Too old frames 0 No dest, multicast
0 Deferred frames 0 No dest, broadcast
0 1 collision frames
0 2 collision frames 0 FCS errors
0 3 collision frames 0 Oversize frames
0 4 collision frames 0 Undersize frames
0 5 collision frames 0 Collision fragments
0 6 collision frames
0 7 collision frames 4355 Minimum size frames
0 8 collision frames 56237 65 to 127 byte frames
0 9 collision frames 1205 128 to 255 byte frames
0 10 collision frames 14 256 to 511 byte frames
0 11 collision frames 67 512 to 1023 byte frames
0 12 collision frames 14528 1024 to 1518 byte frames
0 13 collision frames
0 14 collision frames 0 Flooded frames
0 15 collision frames 3 Overrun frames
0 Excessive collisions 0 VLAN filtered frames
0 Late collisions 0 Source routed frames
0 Good (1 coll) frames 0 Valid oversize frames
0 Good(>1 coll) frames 0 Pause frames
0 Pause frames 0 Symbol error frames
0 VLAN discard frames 0 Invalid frames, too large
0 Excess defer frames 0 Valid frames, too large
0 Too large frames 0 Invalid frames, too small
3672 64 byte frames 0 Valid frames, too small
34066 127 byte frames
2152 255 byte frames
110 511 byte frames
38 1023 byte frames
28 1518 byte frames
CPU utilization for five seconds: 13%/3%; one minute: 12%; five minutes: 9%
77 1317620 3220725 409 9.27% 8.35% 6.20% 0 IP Input
How does 1400 packets/second (4mbits) cause my 3550 to drop packets?
Our network have been ddosed very heavily for the last 15 days.
These attacks are relatively small 50 - 100 mbits at most but in very very high PPS rate.My firewall counts 10Billion packets in a single hour of an attack period.
We are dealing with these attacks with a combination of freebsd pf transparent bridge firewalls and mostly null routing.
I were able to capture some packets from different attacks from last week and today.
After deeply checking these attack capture files I can see that our attack comes from several thousands different spoofed Ip addresses but always the same mac address in their packet headers.So I thought if this attack is coming to us from a single machine rather than hundreds of different zombie servers.
I don't have a clue how to trace back this attack and find the real ip address behind. My upstream provider also don't have enough knowledge to help me.
So after todays attack I thought about sharing my capture files during attack and hope that someone here will help me. And show me a way to trace back these attacks.
ip_conntrack: table full, dropping packet
What does that error mean? It's related to iptables right? When I do this cat /proc/sys/net/ipv4/ip_conntrack_max, I get
65536
I increased it
131072
Because someone recommended me this number because I have 4gb of RAM. But I still get the table full errors or
host kernel: printk: 500 messages suppressed
What should I do? Should I keep increasing the number? How do I know how much I can increase it by?
a tool that can measure how much packet loss we are having on a given server by looking at the packets being sent from it. I.e, something than looks at all TCP/80 connections and measures how many packets and bytes are being retransmitted vs actual packets and bytes sent.
This documents explains it:
[url]
We need this to measure network performance of different hosts where we have dedicated servers. This would be a good way of measuring performance with the actual data of our users.
Does anyone know of such tool? I.e, something that can say
2532 packets/second - 132 retransmits/second (4.8%)
25.43Mbps/sec total traffic - 24.84 Mbps/sec actual data sent - 0.59Mbps retransmits
Even better if it can then break it out on IP prefixes. like
192.0/16: 0.2% retransmits
192.1/16: 3.2% retransmits
192.2.16: 0.3% retransmits
192.3/16: 22.5% retransmits
192.4/16: 0.3% retransmits
This would be a good indicator of connectivity between the host where the tests are ran and other specific hosts.
