2013年12月8日星期日

Cisco 3560 ACL and Syn Protect

We have added the given acl to our cisco WS-C3560X-48T-L  router
Extended IP access list 103
    10 permit tcp any host 77.223.156.156 eq www log (136803 matches)
    20 permit tcp any host 77.223.156.156 eq ftp log
    30 permit tcp any host 77.223.156.156 eq telnet log
    40 permit tcp any host 77.223.156.156 eq pop3 log
    50 permit tcp any host 77.223.156.156 eq smtp log
    60 permit tcp any host 77.223.156.156 eq 443 log
    70 permit tcp any host 77.223.156.156 eq 3389 log (2508 matches)
    80 permit tcp any host 77.223.156.156 eq domain log
    90 permit udp any host 77.223.156.156 eq domain log (68 matches)
    100 deny ip any host 77.223.156.156 log (5633 matches)
    110 permit ip any any (24 matches)
and as you should see there is a high match of www port and if we check it deeply ,
it seems as a ddos or botnet. should i protect the machine from the router for syn ?
you will see multiple same ip address.


Looks like it must be a router feature and not a layer 3 switch feature for Cisco. WS-C3560X-48T-S  Another reason to add to the list of why l3 switches shouldn't be placed on the internet edge. Sorry man, but you need some type of firewalling. An acl just isn't enough these days.

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