Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 137
IP fragments ACL examples, Layer 4 ACL rules examples
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• If an explicit deny is configured, the second and subsequent fragments will not hit the implicit permit rule for fragments. • Loopback interfaces do not support ACLs using the IP fragment option. If you configure an ACL with the fragments option and apply it to a loopback interface, the command is accepted, but the ACL entries are not actually installed the offending rule in CAM. IP fragments ACL examples The following configuration permits all packets (both fragmented & non-fragmented) with destination IP 10.1.1.1. The second rule does not get hit at all. FTOS(conf)#ip access-list extended ABC FTOS(conf-ext-nacl)#permit ip any 10.1.1.1/32 FTOS(conf-ext-nacl)#deny ip any 10.1.1.1./32 fragments FTOS(conf-ext-nacl) To deny second/subsequent fragments, use the same rules in a different order. These ACLs deny all second & subsequent fragments with destination IP 10.1.1.1 but permit the first fragment & non fragmented packets with destination IP 10.1.1.1 . FTOS(conf)#ip access-list extended ABC FTOS(conf-ext-nacl)#deny ip any 10.1.1.1/32 fragments FTOS(conf-ext-nacl)#permit ip any 10.1.1.1/32 FTOS(conf-ext-nacl) Layer 4 ACL rules examples In the below scenario, first fragments non-fragmented TCP packets from 10.1.1.1 with TCP destination port equal to 24 are permitted. All other fragments are denied. FTOS(conf)#ip access-list extended ABC FTOS(conf-ext-nacl)#permit tcp host 10.1.1.1 any eq 24 FTOS(conf-ext-nacl)#deny ip any any fragment FTOS(conf-ext-nacl) In the following, TCP packets that are first fragments or non-fragmented from host 10.1.1.1 with TCP destination port equal to 24 are permitted. Additionally, all TCP non-first fragments from host 10.1.1.1 are permitted. All other IP packets that are non-first fragments are denied. FTOS(conf)#ip access-list extended ABC FTOS(conf-ext-nacl)#permit tcp host 10.1.1.1 any eq 24 FTOS(conf-ext-nacl)#permit tcp host 10.1.1.1 any fragment FTOS(conf-ext-nacl)#deny ip any any fragment FTOS(conf-ext-nacl) To log all the packets denied and to override the implicit deny rule and the implicit permit rule for TCP/ UDP fragments, use a configuration similar to the following. FTOS(conf)#ip access-list extended ABC FTOS(conf-ext-nacl)#permit tcp any any fragment FTOS(conf-ext-nacl)#permit udp any any fragment FTOS(conf-ext-nacl)#deny ip any any log FTOS(conf-ext-nacl) IP Access Control Lists (ACL), Prefix Lists, and Route-maps | 137
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