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  • iptables advanced routing

    - by Shamanu4
    I have a Centos server acting as a NAT in my network. This server has one external (later ext1) interface and three internal (later int1, int2 and int3). Egress traffic comes from users via int1 and after MASQUERADE goes via ext1. Ingress traffic comes from ext1, MASQUERADE, and goes via int2 or int3 according to static routes. | ext1 | x.x.x.x/24 +---------|----------------------+ | | | Centos server (NAT) | | | +---|------|---------------|-----+ | | | int1 | | int2 | int3 10.30.1.10/24 | | 10.30.2.10/24 | 10.30.3.10/24 ^ v v 10.30.1.1/24 | | 10.30.2.1/24 | 10.30.3.1/24 +---|------|---------------|-----+ | | | | | | | v v | | ^ -Traffic policer- | | |_____________ | | | | | +------------------|-------------+ | 192.168.0.1/16 | | Clients 192.168.0.0/16 The problem: Egress traffic seems to be dropped after PREROUTING table. Packet counters are not changing on MASQUERADE rule in POSTROUTING. If I change the routes to clients causing the traffic go back via int1 - everything works perfectly. current iptable configuration is very simple: # cat /etc/sysconfig/iptables *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -I INPUT 1 -i int1 -j ACCEPT -A FORWARD -j ACCEPT COMMIT *nat -A POSTROUTING -o ext1 -j MASQUERADE # COMMIT Can anyone point me what I'm missing? Thanks. UPDATE: 192.168.100.60 via 10.30.2.1 dev int2 proto zebra # routes to clients ... 192.168.100.61 via 10.30.3.1 dev int3 proto zebra # ... I have a lot of them x.x.x.0/24 dev ext1 proto kernel scope link src x.x.x.x 10.30.1.0/24 dev int1 proto kernel scope link src 10.30.1.10 10.30.2.0/24 dev int2 proto kernel scope link src 10.30.2.10 10.30.3.0/24 dev int3 proto kernel scope link src 10.30.3.10 169.254.0.0/16 dev ext1 scope link metric 1003 169.254.0.0/16 dev int1 scope link metric 1004 169.254.0.0/16 dev int2 scope link metric 1005 169.254.0.0/16 dev int3 scope link metric 1006 blackhole 192.168.0.0/16 default via x.x.x.y dev ext1 Clients have 192.168.0.1 as gateway, which is redirecting them to 10.30.1.1

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  • Using BIND as a Personal DNS Server on Windows XP

    - by Sam
    Hello, My ISP's DNS server is very crappy and I've been trying out various alternatives to it. I came across Treewalk ( http://ntcanuck.com/ ) and BIND, and decided to use Treewalk as it seemed easier. But it's performance hasn't been satisfactory. Can someone please guide me on how to setup BIND on my standalaone Windows XP 3 system which connects to the internet using PPPOE? (Note: I am aware about OpenDNS / Google / other public DNS servers but do not wish to use them).

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  • How to Enable IPtables TRACE Target on Debian Squeeze (6)

    - by bernie
    I am trying to use the TRACE target of IPtables but I can't seem to get any trace information logged. I want to use what is described here: Debugger for Iptables. From the iptables man for TRACE: This target marks packes so that the kernel will log every rule which match the packets as those traverse the tables, chains, rules. (The ipt_LOG or ip6t_LOG module is required for the logging.) The packets are logged with the string prefix: "TRACE: tablename:chain- name:type:rulenum " where type can be "rule" for plain rule, "return" for implicit rule at the end of a user defined chain and "policy" for the policy of the built in chains. It can only be used in the raw table. I use the following rule: iptables -A PREROUTING -t raw -p tcp -j TRACE but nothing is appended either in /var/log/syslog or /var/log/kern.log! Is there another step missing? Am I looking in the wrong place? edit Even though I can't find log entries, the TRACE target seems to be set up correctly since the packet counters get incremented: # iptables -L -v -t raw Chain PREROUTING (policy ACCEPT 193 packets, 63701 bytes) pkts bytes target prot opt in out source destination 193 63701 TRACE tcp -- any any anywhere anywhere Chain OUTPUT (policy ACCEPT 178 packets, 65277 bytes) pkts bytes target prot opt in out source destination edit 2 The rule iptables -A PREROUTING -t raw -p tcp -j LOG does print packet information to /var/log/syslog... Why doesn't TRACE work?

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  • How do i enable innodb on ubuntu server 10.04

    - by Matt
    Here is my entire my.cnf [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # Here is entries for some specific programs # The following values assume you have at least 32M ram # This was formally known as [safe_mysqld]. Both versions are currently parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] key_buffer = 224M sort_buffer_size = 4M read_buffer_size = 4M read_rnd_buffer_size = 4M myisam_sort_buffer_size = 12M query_cache_size = 44M # # * Basic Settings # # # * IMPORTANT # If you make changes to these settings and your system uses apparmor, you may # also need to also adjust /etc/apparmor.d/usr.sbin.mysqld. # user = mysql socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 127.0.0.1 # # * Fine Tuning # #key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover = BACKUP #max_connections = 100 #table_cache = 64 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M #query_cache_size = 16M # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 log_error = /var/log/mysql/error.log # Here you can see queries with especially long duration #log_slow_queries = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] #no-auto-rehash # faster start of mysql but no tab completition [isamchk] key_buffer = 16M # # * IMPORTANT: Additional settings that can override those from this file! # The files must end with '.cnf', otherwise they'll be ignored. # !includedir /etc/mysql/conf.d/ And here is my show engines call....i have no idea what i need to do to enable innodb show engines; +------------+---------+----------------------------------------------------------------+--------------+------+------------+ | Engine | Support | Comment | Transactions | XA | Savepoints | +------------+---------+----------------------------------------------------------------+--------------+------+------------+ | MyISAM | DEFAULT | Default engine as of MySQL 3.23 with great performance | NO | NO | NO | | MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO | | BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO | | CSV | YES | CSV storage engine | NO | NO | NO | | MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO | | FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL | | ARCHIVE | YES | Archive storage engine | NO | NO | NO | +------------+---------+----------------------------------------------------------------+--------------+------+------------+ 7 rows in set (0.00 sec)

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  • CPU Benchmark - Set Load, usage spikes

    - by iulianchira
    I need a CPU benchmark to test the performance impact of various power management policies. I must be able to set the load (e.g. to get a relatively steady load of 20%-30%-60%) and to simulate usage spikes (set frequency of spikes). I would also like it to be scriptable so as to be able to change benchmark settings in an indirect manner.

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  • Raid0 setup - What should 'my computer' say?

    - by superexsl
    Hey, I'm not a hardware person, so maybe someone here could help me. I ordered a PC from Dell that has "Serial ATA Raid 0 "Stripe"(7200RPM)Dual HDD" (2x500gb). However, I've just noticed that there's only one HD of 1TB (which is the default option when ordering). Should I be seeing two HDDs in "My Computer" or does the Raid0 setup simply improve performance rather than have (and display) two individual HDDs? How can I check if my computer does have a 'raid0' setup? Thanks

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  • how do you monitor your lamp server?

    - by ajsie
    i wonder how one can monitor a lamp server (ubuntu) on production. are there any standard tools for this to watch the server performance/load in realtime via the browser? how mysql, linux, apache etc are doing... what is best practice regarding this? any tutorials would be great. thanks!

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  • OpenOffice 3 takes forever to open

    - by Joey Adams
    I'm on Fedora 14, and OpenOffice 3.3.0 takes a long time to open (about 30 seconds, sometimes less). It isn't a CPU or disk performance issue, it's just simply a very long delay before the program opens. It appears to be a frivolous network connection timing out. According to Wireshark, it tries to look up: dulcimer.(none) which fails, after which it tries to look up: dulcimer.(none).mylitestream.com (dulcimer is my hostname, and LiteStream is my ISP) Is there a way to work around this bug in OpenOffice?

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  • I'm ready to boot from vhd, how about you?

    - by tony roth
    I've been testing native vhd boot on several servers, and it seems to be pretty transparent and none of my seat of the pants testing has notice any difference in performance. I have a bunch of servers to roll out that will have the following features/roles dfsr dhcp iis application server dc <- haven't tested this yet but see no reason why it won't work. any opinions/ideas on this?

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  • munin to monitor apache hits on particular URLs

    - by bobinabottle
    We are having a problem with our web application, and are currently monitoring performance via munin. We have defined a list of URLs that are causing problems, and am hoping for munin to find out from the apache logs when those urls are being hit. Does anyone know how to set this up? Thanks! :)

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  • PHP Websites: Very high IOPS

    - by Khuram
    We are hosting a set of websites on VM Cloud. These sites were previously on a couple of dedicated servers but to enhance performance, we transferred them onto a Cloud environment. The Cloud has SSD storage but they are now saying that we have very high IOPS and are goign to degrade us if we do not do anything soon. We have good PHP Websites but they are run without any Caching. how do I start to debug this? Sincerely, Khuram

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  • HVM virtualization with PV drivers on XenServer

    - by Nathan
    Is it possible to create an HVM guest in XenServer 5.5 that uses PV drivers for disk and network without being fully paravirutalized? This should give me decent performance from the VM without having to jump through hoops to create a PV guest when a pre-built template doesn't exist. Since PV drivers exist for Windows, and XenServer provides templates for windows that use HVM virtualization this must be possible, I just don't see how to configure this myself.

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  • HP Smart Array p400i with Intel X25-M 160 SSD

    - by user67304
    I have a pair of x25-M 160 Intel SSD's in an HP DL360 G5 with a p400i Smart Array running 512 BBWC. The disk performance I am getting on this box and another identical one does not come close to matching the same two drives running through a cheap 3ware RAID card. Any idea? I have played with the cache settings, but nothing allows me to get the same results. It seems like the Smart Array controller is the bottleneck.

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  • Does software RAID 1 in Windows 7 improve read speeds?

    - by Rich
    As the title says, does software RAID 1 (mirroring) in Windows 7 improve read speeds? I'd like to set up RAID 1 to help protect my important documents (yes, yes, I know it's not a backup), but performance is also important to me. As I understand it, RAID 1 should theoretically be able to improve my read speeds by n times, where n is the number of disks. Is Windows 7 able to get this boost? I haven't been able to find out this information anywhere.

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  • Dedicated hard disk for Informix SE dbname.dbs files & dedicated ramdisk for /tmp files.

    - by Frank Computer
    INFORMIX-SE 7.2: I would like to dedicate a hard disk, exclusively for my dbname.dbs directory which holds all the .dat and .idx files, and create a ramdisk for my /tmp temporary files in order to improve performance. I would also like to strip down the OS from any unecessary files and processes to minimize overhead for my dedicated application. Is this a good idea and are there any roadmaps for accomplishing this?

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  • HP Smart Array p400i with Intel X25-M 160 SSD

    - by user67304
    I have a pair of x25-M 160 Intel SSD's in an HP DL360 G5 with a p400i Smart Array running 512 BBWC. The disk performance I am getting on this box and another identical one does not come close to matching the same two drives running through a cheap 3ware RAID card. Any idea? I have played with the cache settings, but nothing allows me to get the same results. It seems like the Smart Array controller is the bottleneck.

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  • Connection Filtering with Multiple DNSBL's?

    - by JohnyD
    Is there any advantage or disadvantage to using multiple DNSBL's with ones connection filtering? I just switched from SpamHaus to BarracudaCentral but have added in SpamHaus to test for increased effectiveness. So far there is no dip in performance and no increased load on our SMTP server.

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  • How to maintain a SSD drive on Ubuntu ?

    - by Julien Nicoulaud
    I am running Ubuntu 10.04 on a Intel X25-M PostVille 160 Go SSD drive. How can I tell if there's something wrong ? What should/can I do to maintain its performance/health ? Should I use TRIM and how often ? This may look as a duplicate of this question, but I am more asking in term of good practices and learning how to use this new technology the right way...

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  • How does BTRFS compare to ZFS?

    - by Zubair
    I am considering which OS and filesystem to use on some new servers I have and am considering either Free BSD with ZFS, or Linux with BTRFS. The programs I have run on both systems, so the only issue is reliability of the filesystems and performance, etc.

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  • Why is the Task Manager Total Physical Memory not 2048 MB or 2 GB

    - by Dorothy
    I found 3 numbers for the Total Physical Memory: In the Task Manager under the Performance tab: 1978 MB In Computer Properties: 2 GB And running wmic computersystem get TotalPhysicalMemory /format:list in the command line: 2074554368 Bites Number 1 matches Number 3 except Number 1 is rounded. When I convert Number 3 to GB 2074554368 / 1024 / 1024 / 1024 I don't quite get 2 GB. I get 1.93207932 GB. Why does Number 1 and Number 3 not match Number 2?

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