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| [[Kategorie:Infrastruktur]] | | #REDIRECT [[HQ/Netz#Problembehebung]] |
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| {{NiftyDiv|
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| Farbe=#aafd72|
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| Inhalt=
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| Vermutlich bist du auf diese Wikiseite aufmerksam geworden weil das Internet im HQ nicht funktioniert :>
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| Viel Spaß beim fixen ...
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| }}
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| == benötigte Software ==
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| * Linux
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| <source lang=bash>
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| sudo apt-get install tcpdump arping telnet
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| </source>
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| * FreeBSD
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| <source lang=bash>
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| pkg install arpdig arping
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| </source>
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| == starte dein Netzwerk neu! ==
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| Versuch zunächst dein Interface neu zu starten (um eine frische IP vom DHCP-Server zu bekommen):
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| * Linux
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| <source lang=bash>
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| sudo /etc/init.d/networking restart
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| </source>
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| * FreeBSD
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| <source lang=bash>
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| /etc/rc.d/netif restart
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| </source>
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| == Hast du eine IP-Adresse? ==
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| * Linux
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| <source lang=bash>
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| ip a
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| 3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
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| link/ether 00:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
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| inet 172.22.99.100-200/24 brd 172.22.99.255 scope global wlan0
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| valid_lft forever preferred_lft forever
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| inet6 2001:4dd0:fb82:c3d2:ffff:ffff:ffff:fff/64 scope global dynamic
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| valid_lft 180sec preferred_lft 60sec
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| inet6 fe80::ffff:ffff:ffff:fff/64 scope link
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| valid_lft forever preferred_lft forever
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| </source>
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| * FreeBSD
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| <source lang=bash>
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| ifconfig
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| wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
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| ether 00:ff:ff:ff:ff:ff
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| inet6 fe80::ffff:ffff:ffff:ffff%wlan0 prefixlen 64 scopeid 0x7
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| inet6 2001:4dd0:fb82:c3d2:ffff:ffff:ffff:ffff prefixlen 64 autoconf
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| inet 172.22.99.100-200 netmask 0xffffff00 broadcast 172.22.99.255
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| nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
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| media: IEEE 802.11 Wireless Ethernet OFDM/54Mbps mode 11g
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| status: associated
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| ssid C3D2 channel 6 (2437 MHz 11g) bssid f4:ec:38:ba:1d:ac
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| country US authmode OPEN privacy OFF txpower 0 bmiss 7 scanvalid 60
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| protmode CTS roaming MANUAL
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| </source>
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| === IP-Adress Dublikate suchen ===
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| Überprüfe zuerst ob die gewünschte IP-Adresse, im Bereich 100-200, schon vergeben ist:
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| z.B. 172.22.99.199
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| * Linux
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| <source lang=bash>
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| arping -i wlan0 -c 3 172.22.99.199
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| --- 172.22.99.199 statistics ---
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| 3 packets transmitted, 0 packets received, 100% unanswered (0 extra)
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| arping -i wlan0 -D -c 3 172.22.99.199
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| ... 100% packet loss
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| </source>
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| * FreeBSD
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| <source lang=bash>
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| arping -i wlan0 -c 3 172.22.99.199
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| --- 172.22.99.199 statistics ---
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| 3 packets transmitted, 0 packets received, 100% unanswered (0 extra)
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| arping -i wlan0 -D -c 3 172.22.99.199
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| ... 100% packet loss
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| </source>
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| === IP-Adresse selbst geben ===
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| * Linux
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| <source lang=bash>
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| sudo killall dhclient
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| sudo ifconfig wlan0 inet 172.22.99.199 netmask 255.255.255.0
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| </source>
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| * FreeBSD
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| <source lang=bash>
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| sudo killall dhclient
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| ifconfig wlan0 inet 172.22.99.199 netmask 255.255.255.0
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| </source>
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| * IPv6 wird mit SLAAC verteilt ...
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| == Ist das Gateway erreichbar? ==
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| primäres:
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| <source lang=bash>
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| ping 172.22.99.1
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| </source>
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| sekundäres:
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| <source lang=bash>
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| ping 172.22.99.4
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| </source>
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| === Default-Gateway ändern (auf sekundär) ===
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| * Linux
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| <source lang=bash>
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| sudo route del default
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| sudo route add default gw 172.22.99.4 wlan0
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| </source>
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| * FreeBSD
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| <source lang=bash>
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| /etc/rc.d/routing restart
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| route del default
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| route add default 172.22.99.4
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| </source>
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| Überprüfung der Routingtabelle mit netstat
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| <source lang=bash>
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| netstat -nr
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| Kernel-IP-Routentabelle
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| Ziel Router Genmask Flags MSS Fenster irtt Iface
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| 0.0.0.0 172.22.99.1 0.0.0.0 UG 0 0 0 wlan0
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| 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 wlan0
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| 172.22.99.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0
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| </source>
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| === IPv6 Gateway ermitteln ===
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| * Linux
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| <source lang=bash>
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| ip -6 neighbour
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| fe80::f6ec:38ff:feba:1dac dev wlan0 lladdr f4:ec:38:ba:1d:ac router DELAY
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| </source>
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| * FreeBSD
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| <source lang=bash>
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| ndp -a
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| </source>
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| (S Flags = SR)
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| == funktioniert der lokale DNS Cache? ==
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| primär:
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| <source lang=bash>
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| 172.22.99.51
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| </source>
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| sekundär:
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| <source lang=bash>
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| 172.22.99.251
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| </source>
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| * Linux
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| <source lang=bash>
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| dig ANY @172.22.99.51 heise.de
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| </source>
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| * FreeBSD
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| <source lang=bash>
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| drill ANY @172.22.99.251 heise.de
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| </source>
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| === externe DNS Resolver verwenden ===
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| <source lang=bash>
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| sudo vi /etc/resolv.conf
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| search hq.c3d2.de
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| nameserver 74.82.42.42
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| nameserver 213.73.91.35
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| </source>
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| == funktioniert der lokale Web Cache? ==
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| <source lang=bash>
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| telnet 172.22.99.53 3128
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| Trying 172.22.99.53...
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| Connected to 172.22.99.53.
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| Escape character is '^]'.
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| </source>
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| === Web Cache vorübergehend deaktivieren ===
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| z.B.: FireFox
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| Preferences -> Advanced -> Network -> Settings -> von Auto-detect Proxy auf NO
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