Difference between revisions of "Ethernet"
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(Reverted edits by Ypebezimyx (Talk) to last version by 127.0.0.1) |
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+ | == general Linux commands == |
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− | * Avere informazioni su tutte le interfaccie di rete: |
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− | == Ethernet in Linux == |
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ifconfig -a |
ifconfig -a |
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* attivare la scheda di rete eth0 (senza script di ifup/ifdown) |
* attivare la scheda di rete eth0 (senza script di ifup/ifdown) |
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ifconfig eth0 up |
ifconfig eth0 up |
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+ | * disattivare la scheda di rete eth0 (senza script di ifup/ifdown) |
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+ | ifconfig eth0 down |
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* Chiedere in broadcast un indirizzo ip su eth0 (!!!) |
* Chiedere in broadcast un indirizzo ip su eth0 (!!!) |
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dhclient eth0 |
dhclient eth0 |
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# tail -50 /var/log/messages |grep -A4 eth0 |
# tail -50 /var/log/messages |grep -A4 eth0 |
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NETDEV WATCHDOG: eth0: transmit timed out |
NETDEV WATCHDOG: eth0: transmit timed out |
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− | Mar 26 14:21:39 |
+ | Mar 26 14:21:39 kernel: eth0: transmit timed out, tx_status 00 status e000. |
− | Mar 26 14:21:39 |
+ | Mar 26 14:21:39 kernel: diagnostics: net 0cf2 media 8880 dma 000000a0 fifo 0000 |
− | Mar 26 14:21:39 |
+ | Mar 26 14:21:39 kernel: Flags; bus-master 1, dirty 1048374(6) current 1048390(6) |
− | Mar 26 14:21:39 |
+ | Mar 26 14:21:39 kernel: Transmit list 16c7f5c0 vs. d6c7f5c0. |
* scanneriz1zare una rete privata: |
* scanneriz1zare una rete privata: |
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for a in `seq 1 254`; do echo -n -e "\r $a ";ping -c1 192.168.1.$a|grep "bytes from "; done |
for a in `seq 1 254`; do echo -n -e "\r $a ";ping -c1 192.168.1.$a|grep "bytes from "; done |
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− | == |
+ | == host scanning == |
+ | * '''nmap''' is the master tool, then everything follows. |
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+ | nmap <host> |
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+ | * a more specific scan, suggested from [[http://www.gavinpearce.com/blog/check-for-valid-server-name-using-url-rewrite-else-redirect-182| Gavin Pearce]] |
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+ | nmap -sS -p0-65535 -P0 -T4 --osscan_limit --osscan_guess --host_timeout 15m --max-retries 0 --min_parallelism 100 --max_parallelism 500 -O -oX -V <host> |
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+ | |||
+ | == subnet scan == |
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+ | * this command will scan all host in the 10.10.10.0/24 subnet |
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+ | nmap -sP 10.10.10.0-254 |
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+ | nmap -sP 192.168.82.0/24 |
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+ | == Cisco == |
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* para conectar un host directo a un puerto de un router (Cisco) |
* para conectar un host directo a un puerto de un router (Cisco) |
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cisco-6500# |
cisco-6500# |
Revision as of 15:18, 6 April 2014
general Linux commands
ifconfig -a
- attivare la scheda di rete eth0 (senza script di ifup/ifdown)
ifconfig eth0 up
- disattivare la scheda di rete eth0 (senza script di ifup/ifdown)
ifconfig eth0 down
- Chiedere in broadcast un indirizzo ip su eth0 (!!!)
dhclient eth0
- Sapere se hai problemi con la scheda (il NIC)
# tail -50 /var/log/messages |grep -A4 eth0 NETDEV WATCHDOG: eth0: transmit timed out Mar 26 14:21:39 kernel: eth0: transmit timed out, tx_status 00 status e000. Mar 26 14:21:39 kernel: diagnostics: net 0cf2 media 8880 dma 000000a0 fifo 0000 Mar 26 14:21:39 kernel: Flags; bus-master 1, dirty 1048374(6) current 1048390(6) Mar 26 14:21:39 kernel: Transmit list 16c7f5c0 vs. d6c7f5c0.
- scanneriz1zare una rete privata:
for a in `seq 1 254`; do echo -n -e "\r $a ";ping -c1 192.168.1.$a|grep "bytes from "; done
host scanning
- nmap is the master tool, then everything follows.
nmap <host>
- a more specific scan, suggested from [Gavin Pearce]
nmap -sS -p0-65535 -P0 -T4 --osscan_limit --osscan_guess --host_timeout 15m --max-retries 0 --min_parallelism 100 --max_parallelism 500 -O -oX -V <host>
subnet scan
- this command will scan all host in the 10.10.10.0/24 subnet
nmap -sP 10.10.10.0-254 nmap -sP 192.168.82.0/24
Cisco
- para conectar un host directo a un puerto de un router (Cisco)
cisco-6500# cisco-6500#conf t cisco-6500(config)#int gi3/44 cisco-6500(config-if)#spanning-tree port ? port-priority portfast cisco-6500(config-if)#spanning-tree portfast ? disable Disable portfast for this interface trunk Enable portfast on the interface even in trunk mode <cr> cisco-6500(config-if)#spanning-tree portfast