• From the given image below, you can observe that instead of the ICMP protocol, the ping request has been sent through NBNS (NetBIOS Name Service) protocol through port 137 which is a UDP port. • By default, a ping sends 4 packets of the request and receives the same number of the packet as a reply from the host.

Address Mask Request is an ICMP query message, normally sent by a host to a router in order to obtain an appropriate subnet mask. than use wireshark to capture packets when you turn pc or router. ICMP type 17 is request, with code is 0, Address Mask field can be 0.

"deny icmp any any" denies all the ping packets originating from R2, that is the ICMP echo-request. But as I mentioned, trace route (the other is called tracert) uses UDP probes. So the above, wouldn't block an incoming UDP packet but ICMP. So the below statement, blocks the incoming UDP probes. 20 deny udp any any range 33434 33529

2021年12月2日 · Also, things are not adding up about your packet capture. Why are the src MACs the same between the ARP request and the ICMP echo request? The guy sending the ARP request for 10.1.13.1 saying "tell 10.1.13.3" (presumably R3) is using the same src mac address as the guy sending the icmp echo request who claims to be using 10.1.34.4 (presumably R4).

The traceroute is made with multiple Echo request. The device send one by one an echo request with TTL at one, after that the process incresse the TTL for the next hop. Implementation . Traceroute, by default, sends a sequence of User Datagram Protocol (UDP) packets addressed to a destination host; ICMP Echo Request or TCP SYN packets can also ...

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timestamp-request. traceroute. unreachable. ilse-asa(config-service-object-group)# service icmp . As you can see, you may specify an icmp type (and if you wish in addition an icmp code), if you want to restrict the entry to a specific icmp type (and maybe icmp code within that icmp type).

3 - BA1 receives the ICMP request destined for 172.16.1.106 with a source of 11.0.0.2 and forwards the packet to 172.16.1.106. 4 - BA2 receives the ICMP request destined for itself with a source of 172.16.1.105 and replies. This is where i believe it gets a bit messed up as each router has a route to get to the network, but NAT doesn't work ...

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It should be denying any ICMP request from network 192.168.20.0 0.0.0.255 (VLAN20) to 192.168.10.0 0.0.0.255 then I'm not sure what to add (echo, echo reply..) To allow any other traffic I should add an permit ip any any ?