Difference between revisions of "Ethernet"
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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) | ||
ifconfig eth0 up | 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 (!!!) | * Chiedere in broadcast un indirizzo ip su eth0 (!!!) | ||
dhclient eth0 | dhclient eth0 | ||
| Line 16: | Line 18: | ||
== host scanning == | == host scanning == | ||
* '''nmap''' is the master tool, then everything follows. | * '''nmap''' is the master tool, then everything follows. | ||
nmap <host> | nmap <host> | ||
* a more specific scan, suggested from [[http://www.gavinpearce.com/blog/check-for-valid-server-name-using-url-rewrite-else-redirect-182| Gavin Pearce]] | * a more specific scan, suggested from [[http://www.gavinpearce.com/blog/check-for-valid-server-name-using-url-rewrite-else-redirect-182| 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> | 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 == | == Cisco == | ||
* 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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<cr> | <cr> | ||
cisco-6500(config-if)#spanning-tree portfast | cisco-6500(config-if)#spanning-tree portfast | ||
== Linux Routing Table == | |||
*:example data | |||
uplink1_ip=192.168.0.2 | |||
uplink1_gw=192.168.0.1 | |||
uplink1_if=ens31 | |||
uplink2_ip=1.2.3.4 | |||
uplink2_gw=1.2.3.1 | |||
uplink2_if=ens32 | |||
*show main table (and save) | |||
ip route show table main | |||
*create the new table for uplink2 | |||
echo 202 uplink2 >> /etc/iproute2/rt_tables | |||
ip route add 1.2.3.1/32 dev ens32 src 1.2.3.4 table uplink2 | |||
ip route add default via 1.2.3.1 table uplink2 | |||
ip rule add from 1.2.3.4 table uplink2 | |||
Latest revision as of 12:49, 11 June 2021
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
Linux Routing Table
- example data
uplink1_ip=192.168.0.2 uplink1_gw=192.168.0.1 uplink1_if=ens31 uplink2_ip=1.2.3.4 uplink2_gw=1.2.3.1 uplink2_if=ens32
- show main table (and save)
ip route show table main
- create the new table for uplink2
echo 202 uplink2 >> /etc/iproute2/rt_tables
ip route add 1.2.3.1/32 dev ens32 src 1.2.3.4 table uplink2 ip route add default via 1.2.3.1 table uplink2 ip rule add from 1.2.3.4 table uplink2
