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Alkado2015-08-29 11:55:28
Mikrotik
Alkado, 2015-08-29 11:55:28

The people, do all Mikrotik go into reboot if you let zmap through it?

Every time you start zmap to addresses from the wan segment (I start from a host located in the lan segment) Mikrotik reboots
Checked for: RouterOS 6.30.4 and 6.31
Clumsy settings:
/interface ethernet set ether1 name=ether1-gateway
/interface ethernet set ether2 name= ether2-local
/interface bridge add name=bridge-local disabled=no auto-mac=no protocol-mode=rstp
/interface bridge set "bridge-local" admin-mac=[/interface ethernet get ether2-local mac-address]
/interface bridge port add bridge=bridge-local interface=ether2-local
/ip dhcp-client add interface=ether1-gateway disabled=no
/ip address add address=192.168.88.1/24 interface=bridge-local
/ip pool add name="default-dhcp" ranges=192.168.88.10-192.168.88.254
/ip dhcp-server add name=default address-pool="default-dhcp" interface=bridge-local lease-time=10m disabled= no
/ip dhcp-server network add address=192.168.88.0/24 gateway=192.168.88.1
/ip dns {set allow-remote-requests=yes
static add name=router address=192.168.88.1}
/ip firewall nat add chain= srcnat out-interface=ether1-gateway action=masquerade
zmap run from a host connected to ether2-local: zmap -B 10M -p 80 -o jus_test_22.csv xx0.0/16
xx0.0/16 - wan segment
Through 1-2 seconds the router goes into reboot.
After reboot in logs:
system,error,critical System rebooted because of kernel failure
system,error,critical router was rebooted without proper shutdown

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Alkado, 2015-08-29
@Alkado

I understood the reason.
hAP lite (941-2nD) does not have much free RAM (~8Mb) and it simply runs out of ~18000 open sessions. (srcnat eats it up)
zmap -B 10M ... opened >20k connections in a couple of seconds.
And Mikrotik, having no protection from this, simply fell "on the shoulder blades."
I did a couple of tests, replacing -B 10M with -r 2048 - the average number of open connections was around 13000-15000
CPU usage 60-80% free memory 1-0.5 Mb.
Falling "on the shoulder blades" stopped.

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