Networking :: Limiting Bandwith From 2 ISP With Using One Server
Feb 21, 2011
I have 2 ISP where give me IP Public with ISP A (/29) and ISP B (/28). So, I connect this two ISP to unmanaged switch. And from that switch, I take one cable connected to eth0 on the server. (Note : My server have 2 dev ethernet, eth0 and eth1). eth1 will go to the Switch which will go to the LAN.
My Question is : 1. Is this possible to make bandwith control on the gateway server with mode separating International bandwith and local bandwith (my country bandwith)? ie, for my Mail Server I will give the "intl bandwith" only 512 kpbs and for local bandwith with 1Mbps. What a software can I use for this model ?
2. Which model I should to used, with NAT or with Bridging router? That's all for now..
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Jan 7, 2011
I have a webserver with a few users on and i wonder how i can limit the bandwith usage for each user on my server ?
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Oct 18, 2010
We are using squid deplay pools successfully in our lan and it is working very fine but now i want each computer bandwidth to be shaped for each port means that whenever the user make ftp connection with ftp software or whenever the user access outlook express for email each port like smtp,ftp,remote desktop connection will be shaped or otherwords each pc will get fixed bandwidth.
Our Broaband having 1Mbps connection and we have 16 user who access the internet so i want the 1Mbps will distribute in each user. Our Six Users of internet is our directors and managers of the company so i want to give them max speed and 10 users will get low speed.
Six Special users Ip address: 192.168.1.3 to 192.168.1.9. Other Regular users Ip Address: 192.168.1.10 to 192.168.1.20.
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Aug 27, 2010
So: On the VPS / Dedicated Server Linux wich 3 users created. How can I limit bandwidth each in a separate? For example first user speed 1 MB. 5 MB second and third 10 MB. Expect some clear answers. Regards, Silviu!
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Jan 27, 2011
I run Debian 64-bit. I host GameServers on my machine. Yesterday, some corrupt files or error in configurations of one of the game-servers caused my whole system to destabilize. On checking, I saw one of the Gameserver's console giving Net_sendpacket spam errors. I disabled that server and things were fine then. It used up more than 100GB of my bandwidth in just 12 hours.
I deleted the server and copied all the files over again to fix that error. Now I want a prevention to this, if just in case it happens again. I want to limit a sub-user's bandwidth in Linux. Like if I want a user only to use 10GB bandwidth per month + not more than 5MB/second. Is there any way to do it?
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Mar 6, 2011
I have about 5 machines that are under Ddos daily and I use rate-limit for Iptables to protect that and it works good.My UDP ports 20100 to 20400 are actually under Ddos so these are the commands I use:
Code:
A INPUT -p udp -m udp --dport 20100:20500 -m state --state NEW -m recent --set --name DEFAULT --rsource
[code]....
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Sep 24, 2010
My server listens to POP3/IMAP requests. Some users have configured their mailers with high checking frequencies, say once every minute, such that the system logs are full of entries with no significance at all.I'd like to ask if there is a way to limit the per IP frequency of POP3/IMAP access ?I'm using "xinetd" to wrap the "ipop3d" and "imapd" which come with the Alpine package.
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Jul 6, 2010
Im using postfix on my server and i need change a ip adresses for mail boxes.Example : xxx@xxx.com using x.x.x.1 ip adres.and i need yyy@xxx.com how it can use x.x.x.2 adress.How can i do that ?And i need count which mail how much mail sended .How can i count and limit ?
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Apr 12, 2010
You may have seen some other posts by me about my final year college project. Im implementing a web based network management website. Iv got a lot of the functionality working at this stage but one part is allocating bandwidth.
Iv got an eircom 3mb broadband connection and I want to be able to split this between users. At the moment I only have my desktop and laptop on the network. Im looking for advice on how i can allocate bandwidth with iptables and/or the tc tool in ubuntu.
My website is on an ubuntu virtual machine and written in php. Whatever about running the iptables and tc commands from php I still need to figure out the actual commands i need to use in the first place.
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Nov 24, 2010
I was looking for a way to protect my samba server for limiting access to certain domains.Can I use the parameterhosts allow = example.comor something like that or is there another way to do the job for domains
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Nov 30, 2010
I have a teenage daughter that understands Ubuntu, but not so much the terminal, and she does not know the superuser password. Unfortunately, she regularly goes on the Internet during the nighttime and in the early morning. What I am attempting to do is prevent anyone from going onto the Internet during the night (11 PM - 5:30 AM) unless they know the superuser password or a fair bit about the terminal.
I have already tried some commands, however all of them can be bypassed by restarting the computer. ex. sudo ifconfig eth0 down
For additional information on my Internet:
My Internet connection is relatively slow, so I would prefer if the solution does not hinder it any further. It is slow because there is no high-speed in my area, and I am forced to use Xplorenet -> "Fixed Wireless". I do not have a router.
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Jun 25, 2010
I have configured dhcp3-server on my debian box and I'm wanting to offer dhcp on one of the vlan interfaces. The dhcp is functioning but when I test applying it to a different vlan, the original PC can still get an IP. For example: eth1 has vlan100 and vlan200. Our managed switch has the ports configured such the pc1 is on vlan100 and pc2 is on vlan2. This works fine and I can inter-route between vlans with static IPs. Our dhcp config is currently set as:
ping-check true;
ddns-update-style none;
default-lease-time 21600;
max-lease-time 86400;
INTERFACES="vlan100";
authoritative;
[code]....
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Jan 22, 2010
I have a server with a /data/ directory, everything in the /data/ folder has "-rwxrw-rw- 1 root root" permissions.all works fine, multiple users are mounting this over a lan and everyone is able to modify files. However I would like to be able to access the /data/music/ directory from the internet.
Is it possible to configure sshfs to only accept logins from a user restricted to reading the /data/music directory, or would it be possible to tunnel nfs over ssh in such a way that everyone on the lan 192.168.0.xxx has unrestricted access to the data directory, but something coming from outside only has read access to the music directory. Although is one were tunneling nfs over ssh, the nfs mount request would appear to come from the server itself. The router is at 192.168.0.1 and the server is at 192.168.0.3.This Seems very much like what I want to do, however I'm having a bit of trouble getting this to work well with other users mounting with full rights over the lan too.
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Jun 13, 2010
I am currently having problems with my server. Its being DDOSed. I have a vps with Centos 64bit. The attack I want to block is udp flood. I was trying to do something like this: iptables -I INPUT -p udp --dport 123 -m limit --limit 40/s -j DROP but instead of blocking certain hosts it blocks the whole port and during the attack its unreachable. How to limit packets per host or any other way to protect from udp flood.
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Oct 27, 2010
I have a bridged network setup ifconfig -a gives following output
Code:
br0 Link encap:Ethernet HWaddr 00:26:b9:82:42:38
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::226:b9ff:fe82:4238/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:150779 errors:0 dropped:0 overruns:0 frame:0
[Code]...
3) What are these vmnet1,vmnet2,vmnet3,vmne4 which I see above. I used kvm and virt-manager to create a bridged setup.
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Apr 3, 2010
I've been trying for a couple days now to get netem rate limiting to work on a Fedora 12 i686 virtual machine (both on VMware Fusion and KVM), and have had no success.In order to do outbound rate limiting, I want to use the netem token bucket filter (TBF), as described here:[URL]Unfortunately, attempting to use the TBF results in this error:
Code:
[root@f12-build ~]# tc qdisc add dev eth1 parent 1:1 handle 10: tbf rate 256kbit buffer 1600 limit 3000
[code]...
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Jan 12, 2009
i am programming to get a real number to show real-time system bandwidth used ? that mean the bandwidth used at the time my fuction running? am using C language to do that. so help me please!
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Feb 25, 2010
i recently installed ipplan on my server .. but cuz i am new at it i am nt any good . is there some way i can read or refer some book or website and learn all its functionalities ??
1. how do i create a new dns and assign bandwith to it ?
2. how do i assign bandwith to a specific ip in general ?
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Feb 27, 2010
We are using RHEL4 AS U5 and Sendmail version sendmail-8.13.8. How to find out total mail transfer size (month basis) through Sendmail service. Is it possible in linux.
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Mar 7, 2011
I'm using mint 10 - ubuntu 10 derivative. I'm a programmer with 10 years experience with linux comfortable (but not a genius) with the command line. Adept with vim. My security knowledge is woefully low.
My bandwith usage has gone way up. To make a long story short, I am suspecting an intrusion of some sort on my machine. Currently I'm using a router with wireless turned off. I'm running iftop and the Rx total for today (still high) is showing 333MB.
For starters, I have two questions:
1)What should I be looking for in /var/log?
2)Any recommendations on software that might help here?
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Feb 1, 2011
FTP servers I use frequently have imposed a simultaneous connections limit, usually 5-10 at the time. It was no problem under Windows, since Windows artificially limits allowed FTP connections to ~10 as far as I know. But it is a problem under Linux very much since I cannot find how to limit them :/ So far I used these clients: Native FTP client (Places -> Connect to FTP server). No apparent way to limit connections.
FileZilla. Under particular server settings you can limit number of simultaneous connections. Also you can do that globally in Edit -> Preferences -> Transfers. Problem is, it doesn't work, I still keep getting the 530 Sorry the maximum number of clients (10) for this user are already connected. And netstat shows quite a few simultaneous FileZilla connections no matter that I limited them to 1 both in global and local settings.
NCFTPPUT. 10 successful uploads and hi 530. Total Commander under Wine. Same. NetBeans IDE integrated ftp. Same. Some other crapy FTP clients which names I already forgot. Same. OS is Ubuntu 10.04 So, is there any way to force any of these FTP clients to use less than 10 concurrent connections?
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May 20, 2011
I'd like to discourage the SSH bots that try to log into my system (CentOSv5), and among other things, I've changed my SSH port to someting other than 22. As well, I've been playing around with the idea of some iptables rules (note port 22 is used here as example):
Code:
# Allow SSH with a rate limit
iptables -A INPUT -i ppp0 -p tcp --syn --dport 22 -m hashlimit --hashlimit 15/hour --hashlimit-burst 3 --hashlimit-htable-expire 600000 --hashlimit-mode srcip --hashlimit-name ssh -j ACCEPT
iptables -A INPUT -i ppp0 -p tcp --syn --dport 22 -j LOG --log-prefix "[DROPPED SSH]: "
iptables -A INPUT -i ppp0 -p tcp --syn --dport 22 -j DROP
I am *NOT* an iptables expert. What do you all think about the above code snip?
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Sep 10, 2015
Got a few more questions from the Debian Security Howto.
Section "4.11.2 Limiting resource usage: the limits.conf file" page 44
Code: Select allnano /etc/security/limits.conf
At the bottom I get...
Code: Select all#<domain> <type> <item> <value>
#
#* soft core 0
#root hard core 100000
#* hard rss 10000
[code]...
Do I have to uncomment these lines for them to take effect?
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Apr 6, 2010
This is are magic file who kill 20 linux nodes today and.. of course i want to ask - What i can do for limiting size of nscd.log file? i try to find help in man files: nscd and nscd.conf - but nothing about log size. (just paranoia mode with auto restarting.. but this sounds ugly. i need just limit log file size)
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Mar 6, 2011
I have a script that basically takes a list of IP addresses, and pings them to tell me if each device (Access Point) is online or not. The problem with that is, the list contains about a hundred addresses. Making the problem worse is the fact that using a single ICMP packet per device is not an option since, at certain times of the day, the network is too congested to guarantee that a single ICMP packet won't be dropped, despite the device being up and running. That means I need to send multiple pings per device for about a hundred devices. As you can imagine, doing this sequentially takes a while.
What I want to do is make my script open other threads in the background to ping multiple devices in parallel. The problem with that is - if I simply make each ping command run in parallel, soon there are a hundred background tasks, one for each address, and that consumes a lot of CPU (CPU hits 100% and stays there till the script is done). Is there a way I can make about 10 threads run at a time, and any other threads will queue until a spot opens up for them? Kind of like the token bucket, except when there aren't enough tokens, the main script waits until it can launch more background threads that ping the next addresses on the list.
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Apr 3, 2011
How can i limit disk space usage for one user? Like.. User john123, you can only use 100mb of my harddisk. User jake155, you can only use 250mb of my harddisk.
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Jul 26, 2011
I'm using Ubuntu 11.04. I'm running processes that repeatedly spawn Firefox browsers with Flash embedded in the pages. Occasionally the Flash processes (npviewer.bin) spin off and use almost all the CPU power. How can I limit the total CPU usage of all the Flash pieces to no more than 30% of CPU?
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Oct 12, 2010
I have a multi-threaded process running and I have to limit the cpu time used by each of the threads. If 1 of the threads uses the whole of configured CPU time, the other thread should sleep and not consume CPU time in that cycle. 1 thread has higher preference over the other. How can i implement it my CPP code?
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Apr 7, 2009
Is it possible with vixie cron to limit cron's activities by the current load average? Basically I'm looking for the same functionality that's in fcron, but I'm restricted to use the vixie cron with CentOS 5.3.If not, does anyone have any recommendations on limiting the impact that cron has when it runs 20-30 user-specified crontabs at once?
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Dec 13, 2010
On our web server I want to have a WebDAV folder and I would like customers to be able to log in with MySQL authentication from our customers database (this I have set up with no problems and it works fine). HOWEVER, I want each customer to have their own subfolder and, having logged in with access to the main WebDAV folder, I want each customer ONLY to be able to access their own subfolder(s). I don't mind them seeing other subfolders exist but obviously I don't want them to have access to other customers subfolders.
OK, of course I could achieve this by adding new WebDAV locations to the httpd.conf for every customer but with a large number of customers httpd.conf will become very large and messy. I have tried applying further restrictions by putting an .httaccess file in each subfolder but that doesn't work - indeed the presence of a .htaccess file oddly prevents users from seeing any other files in the subfolder but has no effect on the access.
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