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i could increase the maximum internet download speed of my raspberry pi4 running with the most current raspbian 64 bit kernel from 60 70 mb s to a bit over 90 mb s with the following adjustments please note many servers limit downloads e g to 400 mbit s even speed test servers 1 a bash script you could post this into etc rc local network speed iface eth0 speed up internet https datatag web cern ch datatag howto tcp html sbin ifconfig iface txqueuelen 8000 echo 8000 proc sys net core netdev_max_backlog ip link set iface qlen 20000 google bbr https www tecmint com increase linux server internet speed with tcp bbr sysctl w net core default_qdisc fq sysctl w net ipv4 tcp_congestion_control bbr https www cyberciti biz faq rhel centos fedora debian configure rx polling mode ethtool c iface adaptive rx on https cromwell intl com open source performance tuning ethernet html ethtool k iface tx checksum ipv4 on ethtool k iface tx checksum ipv6 on not supported https cromwell intl com open source performance tuning ethernet html ethtool a iface rx on ethtool a iface tx on ethtool g iface rx 4096 tx 4096 kernel tweaks you could put this in etc sysctl d 99 netspeed conf https serverfault com a 758350 kernel sem 350 358400 64 1024 net core rmem_default 262144 net core rmem_max 4194304 net core wmem_default 262144 net core wmem_max 4194304 net ipv4 tcp_window_scaling 1 net ipv4 tcp_adv_win_scale 2 net ipv4 tcp_moderate_rcvbuf 1 net ipv4 tcp_rmem 4096 262144 4194304 net ipv4 tcp_wmem 4096 262144 4194304 net ipv4 tcp_keepalive_time 900 net ipv4 tcp_keepalive_intvl 900 net ipv4 tcp_keepalive_probes 9 3 installing irqbalance sudo apt install irqbalance 4 reboot enjoy 0 comments enable fstrim trim discard support especially for usb sata disks in linux monday august 05 2019 if fstrim tells you discard operation is not supported on a usb disk then you may want to try this tip i m assuming you re using dev sdb below please adjust check if this commands sg_readcap l dev sdb grep unmap shows unmap command supported lbpu 1 it must be a 1 at some point or you re out of luck if that works try unmounting the drive then try this command as root umount media disk echo unmap sys block sdb device scsi_disk provisioning_mode now try again to see if it works mount dev sdb2 media disk fstrim v media diskidea if that works for you find out the device id for the usb device with lsusb and then post the ids into a udev rule exampe id is the startech usb 3 0 to 2 5 sata cable which i ve bought for my raspberry pi 4 echo action add change attrs idvendor 174c attrs idproduct 55aa subsystem scsi_disk attr provisioning_mode unmap etc udev rules d 99 trim ssd discard rules hope this works for you thanks to the original idea 0 comments fritz box vpn mit cisco und ike fehler wednesday july 26 2017 hier zeige ich wie man eine fritz box mit einen cisco vpn verbinden kann damit könnte man grds wohl auch voip über vpn bewerkstelligen ich habe folgende grundkonfiguration für cisco vpn genutzt einfach anpassen und in die fritz box importieren vpncfg connections enabled yes editable no darf nicht an sein zerschießt sonst die einstellungen conn_type conntype_lan name dus net always_renew yes reject_not_encrypted no dont_filter_netbios yes muss immer aktiv sein localip 0 0 0 0 local_virtualip 0 0 0 0 remoteip remote_virtualip 0 0 0 0 localid key_id gruppenname mode phase1_mode_aggressive phase1ss alt all all keytype connkeytype_pre_shared key gruppenschlüssel cert_do_server_auth no use_nat_t yes use_xauth yes xauth valid yes username passwd use_cfgmode yes automatische einrichtung des remote network phase2localid ipnet ipaddr 192 168 178 0 netz der fritz box mask 255 255 255 0 phase2ss esp aes256 3des sha ah no comp lzs no pfs accesslist permit ip any 1 2 3 0 255 255 255 0 remote network permit ip any host 3 4 5 6 einzelner host ike_forward_rules udp 0 0 0 0 500 0 0 0 0 500 udp 0 0 0 0 4500 0 0 0 0 4500 avm hat eine liste der bedeutung der diversen ike fehler aber sie schreiben leider nicht was man zur behebung anpassen muss ich versuche das stellenweise zu ergänzen grundlageninformationen finden sich auch hier einrichtung mit juniper https blog webernetz net 2013 12 02 ipsec site to site vpn juniper screenos avm fritzbox liste der ike fehler bei avm https service avm de help de fritz box 7362 sl avm 016 hilfe_syslog_122 sicherheitseinstellungen http s blog webernetz net 2015 03 11 fritzos ab 06 23 ipsec p2 proposals erweitert probleme nach dem update zu version 6 2 wohl behoben https blog webernetz net 2014 11 25 fritzos ab 06 20 anderungen bei vpns weitere beiträge im webernetz https blog webernetz net tag fritzbox typische fehler ike error 0x2020 hash mismatch in received packet hier gibt es einen fehler bei den gewählten algorithmen vgl tests wohl in phase 1 oder das passwort stimmt nicht bei mir hat diese anpassung geholfen phase1ss alt all all probieren kann man diese dh5 aes sha dh14 aes sha dh15 aes sha def all all alt all all all all all lt8h all all all angeblich kann auch teilweise die mtu schuld sein an diesem fehler sie lässt sich bei der fritz box allerdings nicht anpassen es kann wohl auch an einem falschen key oder der falschen key_id liegen ike error 0x2026 no proposal chosen hier handelt es sich wohl um fehler in phase 2 es stehen u a folgende alternativen zur verfügung esp 3des sha ah no comp no pfs esp 3des sha ah no comp no no pfs esp aes256 3des sha ah no comp lzs no pfs esp aes sha ah all comp lzjh no pfs esp all all ah all comp all pfs esp all all ah all comp all no pfs esp all all ah none comp all pfs esp all all ah none comp all no pfs lt8h esp all all ah none comp all pfs lt8h esp all all ah none comp all no pfs noch ein paar notizen debugging geht über system ereignisse die accesslist bestimmt die routen die über das vpn gehen any any heißt von allen geräten zu allen das bedeutet es wird die default route das will man oft nicht wenn die fritz box in ereignisse gar keine fehler anzeigt liegt meist ein grober konfigurationsfehler vor die fritz box versucht dann gar nicht erst eine verbindung herzustellen die einrichtung des cisco routers wird auch hier beschrieben https blog webernetz net 2014 06 25 ipsec site to site vpn cisco router avm fritzbox die parameter der konfigurationsdatei werden hier teilweise erläutert http www wehavemorefun de fritzbox talk versteckte_features das routing wird hier gut von avm beschrieben https en avm de service fritzbox fritzbox 6840 lte knowledge base publication show 230_ accessing multiple ip networks behind a fritz box over vpn connection between two fritz boxes hier finden sich hilfreiche beispiele nach permit suchen http www wehavemorefun de fritzbox ar7 cfg man darf netbios nie filtern sonst verbindet sich die fritz box gar nicht erst es kann auch helfen die einstellungen der fritz box zu exportieren und sich dort beispielkonfigurationen anzusehen es gibt auch einen passenden artikel zu fritz box vpns mit firewalls in einer aktuellen c t in phase 1 und phase 2 werden außerdem die krypto protokolle proposals und die dauer der schlüsselgültigkeit ausgehandelt lifetimes dieser einstellungsbereich gilt als mutter allen ipsec übels weil es sehr viele optionen gibt 0 comments samsung scanner in your network despite firewall with manual setup wednesday july 26 2017 to manually detect a samsung network scanner with sane you can try this method echo tcp scx sudo tee a etc sane d xerox_mfp conf replace scx with the ip address or resolvable hostname of your scanner try to ping the host e g ping scx before you enter it here this assumes using the drivers from www bchemnet com suldr for some services you may have to restart the service or your computer it fixed using the scanner with an active firewall for me 0 comments diverse probleme mit der fritz box bei fehlerhaften vpn einstellungen wednesday july 26 2017 wenn man die vpn funktion der fritz box nutzt sollte man regelmäßig prüfen ob alle ausgehenden verbindungen funktionieren denn nicht funktionierende ausgehende vpn verbindungen z b kopplung zwischen zwei fritz boxen können zu diversen problemen führen u a schlechte sprachqualität beim voip paketverluste und langsameres internet wenn man eine aktive vpn verbindung hat die die default route setzt z b automatisch via use_cfgmode no kann sogar das internet insgesamt unterbrochen werden die lösung ist einfach den haken links neben der vpn verbindung abwählen und die einstellungen übernehmen 0 comments fix getting the msi pe60 6qe skylake to run linux sunday july 24 2016 after lots of experimentation it turned out that the best boot parameter so far ubuntu 16 10 alpha july 2016 is pci noacpi otherwise e g with acpi noirq there is a crash trying to load the nvidia card and an issue with acpi trying to load _dsm if you want to disable the nivida card completely for 6w or more of power savings use nouveau modeset 0 this might need to be in addition to pci noacpi this might work for lots of other notebooks especially with nvidia graphics and a skylake cpu e g the msi ge62 6qf series 0 comments prioritizing system services with systemd run a process permanently in the background thursday may 05 2016 if you simply want to adjust some priorities here is how to do it in three steps sudo systemctl edit service sudo systemctl daemon reload sudo systemctl restart service read more 0 comments removing all images with rkt tuesday may 03 2016 note this will remove all images not just stale ones set rkt to point to your rkt binary bin sh rkt rkt rkt images sudo rkt image list awk nr 1 print 1 set x sudo rkt gc grace period 1s sleep 1 sudo rkt gc grace period 1s sudo rkt image list sudo rkt image rm images 0 comments forward wake on lan packages bewteen networks with socat friday february 12 2016 if you have two networks and you want to wake a machine in another from network it can be tricky because you can t always set the destination ip address or network an easy fix is to use socat to forward the udp wakeonlan packages to the other network or ip sudo socat v udp4 recvfrom 9 fork udp4 sendto 192 168 1 255 9 you can leave out the v for less verbosity the target network is 192 168 1 255 you can replace this with a specific ip which helps with routers not forwarding broadcasts usually udp port 9 is used but you may change this to port 7 for your setup you will need to be root because port 9 is generally privileged 0 comments fscking precautions snapshots and the undo file friday august 28 2015 if you have a badly corrupted filesystem e g because you had back blocks on the hard drive you have want to take some precautions to make sure fsck doesn t destroy your files this goes especially for large raids something you can always do is test the fsck operation on a dmsetup snapshot for this to work you must boot from a different partition and it must have a sparse file enabled filesystem the path to your snapshot storage file input dev sdb4 cow root sdb4 snapshot 20 terabytes should be enough for your partition otherwise increase this number truncate s 20 000g cow setup a loop for dmsetup snapshots to the cow file loop losetup f losetup loop cow setup the snapshot device echo 0 blockdev getsz input snapshot input loop p 8 dmsetup create top let you know where the snapshot device is echo loop loop top dev mapper top dmsetup status after this you should be able to fsck dev mapper top you can see how much space the cow file actually occupies with du h cow you may also want to get the newest fsck version e g with a newer fsck static package if you end up with many multiply claimed blocks this e2fsck version may help http git hpdd intel com tools e2fsprogs git checkout a wc branch good luck you might need it 0 comments linux raid ignoring dev sdx as it reports dev sdy as failed tuesday august 18 2015 the fix for this problem may be extremely easy what happened is that some disks of the raid failed they were ejected this happens but the raid won t be assembled anymore if the failed disks are first on the mdadm assemble command line because for some reason mdadm does not check what most disks say but what the first disks say so if you have a raid with 10 disks and the first two on the command line are failed it will reject the remaining 8 because the are not compatible all you need to do now is to list those two failed disks at the end with force to activate the raid again instead of mdadm dev md1 assemble dev sdx y dev sd a f try mdadm dev md1 assemble dev sd a f dev sdx y note that there s probably still a good reason for those disks to have been marked as failed 0 comments windows 7 detects only some of the cpus added in kvm fix monday june 22 2015 if windows xp windows 7 maybe even windows 8 or later don t detect all your cpus in kvm you may need to change the settings windows often doesn t like if you have too many cpu sockets try a configuration with 1 or 2 sockets and several cores 0 comments how to dynamically switch between uniprocessor and smp during windows xp boot saturday may 30 2015 if you re running windows xp inside a virtual machine such as virtualbox vmware or kvm you may want to sometimes boot with only one active cpu other times with several cpus if you don t set up windows correctly it will neither boot normally nor in safe mode where it will stop with a blank screen and a blinking cursor but you can edit your boot ini to look like this in order to dynamically switch between one and several processors in windows xp boot loader timeout 5 default multi 0 disk 0 rdisk 0 partition 1 windows operating systems multi 0 disk 0 rdisk 0 partition 1 windows microsoft windows xp pro noexecute optin fastdetect multi 0 disk 0 rdisk 0 partition 1 windows microsoft windows xp pro one processor noexecute optin fastdetect kernel ntoskrnl exe hal halaacpi dll multi 0 disk 0 rdisk 0 partition 1 windows microsoft windows xp pro smp noexecute optin fastdetect kernel ntkrnlmp exe hal halmacpi dll 0 comments the ultimate setup guide for owncloud on small systems such as the raspberry pi saturday may 16 2015 it took me about a year to collect this information there are many guides but all i found are incomplete here s the one guide to rule them all hopefully the guide works on ubuntu and debian without changes it s optimized for resources speed security and ease of use while this runs well on my old phone armv7 512 mb 1000 bogomips it should run even better on a raspberry pi read more 0 comments categories howto owncloud servers accessing public owncloud shares via webdav friday may 15 2015 since owncloud supports server to server sharing you can access public shares via webdav clients you simply use the access token t as user name if there is a password use that as password otherwise leave it blank as url you use the owncloud address with public php webdav at the end https myserver com owncloud public php service files t 12345 webdavs 12345 myserver com owncloud public php webdav 0 comments categories owncloud speeding up your owncloud on small ...
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