We are facing problem of Spamming from our networks. Is there any command in cisco which we can execute on our cisco device to control or block ports responsible for spamming or If some other solution with anyone(except third party device or software) ...
If the spamming is coming from a specific set of hosts, you can add an access-list to block the incoming SMTP traffic. For example:
access-list 101 deny tcp x.x.x.x any eq 25
access-list 101 deny tcp y.y.y.y any eq 25
access-list 101 deny tcp z.z.z.z any eq 25
action-list 101 permit ip any any
Then you can apply that ACL to your inbound interface:
ip access-group 101 in
This is a pretty trivial example, and hard to maintain if you have a lot of spamming hosts. there are better solutions for spam such as a filter running on your SMTP server (e.g. the Open Source Spamassassin). The advantage of such filters is that they are adaptive, and can learn new types of spam.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...