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Which protocol should be allowed when not able to ping a remote device residing behind a firewall?
ICMP is the internet control access protocol . ICMP is the plrotocol that should be allowed when not able to ping a remote device residing behind a firewall. ICMP is the protocol of network layer.
In windows XP you are able to Ipconfig release new but not able to ping to gateway or any systems?
Check your local system's firewall for blocking of ICMP (ping) traffic.
Why filtering ICMP traffics by ACLs is not advised?
Because ICMP traffic, notably ICMP ECHO REQUEST-0 and ECHO REPLY-8 are used in network diagnostic sequences.
What protocols should be blocked to prevent trojans and malicious traffic?
ICMP
You cannot ping pfsense fom your wan network?
Add a firewall rule to allow ICMP from WAN. Firewall | Rules | Add Action - Pass Interface - WAN Protocol - ICMP ICMP type - Any (or echo reply) Source - Any If your WAN is a private subnet, you will need to disable block private networks on the Interfaces | WAN page
Vista Firewall exception rule to allow icmp?
As Admin In Command prompt, type: netsh firewall set icmpsetting 8 enable Enter
Which protocol family must be configured on an interface to allow ICMP traffic to be received?
inet
A PC cannot connect to any remote website ping its default gateway or ping a printer that is functioning property on the local network segment which action will verify that the TCPIP stack is func?
it could be a firewall blocking icmp outbound traffic from said machine, if the machine can still access network functions such as the internet and lan printers its tcpip stack is still intact it could be a firewall blocking icmp outbound traffic from said machine, if the machine can still access network functions such as the internet and lan printers its tcpip stack is still intact.
What computer protocol should be blocked to prevent malicious traffic and Trojan's?
Pretty much every protocol used for malicious traffic and Trojans is also used for legitimate traffic. You cannot block all bad traffic just by filtering on protocols. When given that ICMP and HTTP are both allowed, if you have to block one, block ICMP. Choices were: DNS DHCP ICMP HTTP https://library.skillport.com/courseware/cbtlib/TPSY0201/metadata/eng/TPSY0201B.htm?
What is the function of ICMP?
To handle error messages when a message does not reach it's destination. To announce timeouts and network congestion.
Which port is used by ICMP?
There really is no "port" for icmp but there is a icmp code. If you are looking for the icmp code for echo-reply it is 0 and the echo is 8 For an access list you could do the following: permit icmp any any echo-reply permit icmp any any echo Or the same using the icmp code permit icmp any any 0 permit icmp any any 8
What is the difference between promiscuous mode and non-promiscuous mode?
As promiscuous mode can be used in a malicious way to sniff on a network, one might be interested in detecting network devices that are in promiscuous mode. In promiscuous mode, some software might send responses to frames even though they were addressed to another machine. However, experienced sniffers can prevent this (e.g., using carefully designed firewall settings). An example is sending a ping (ICMP echo request) with the wrong MAC address but the right IP address. If your firewall blocks all ICMP traffic, this will be prevented.
