Question

VLAN Access Control Lists

Asked by: dtadmin

I currently have the following Access Control List assigned to a VLAN interface. Currently it reads "ip access-group in". Does that mean traffic leaving the subnet or entering the subnet from somewhere else.

access-list 104 remark East Wing
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 389
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 522
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 1503
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 1720
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 1731
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 139
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 137
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 138
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 445
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 eq 135
access-list 104 permit tcp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 range 1024 65000
access-list 104 permit icmp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 echo
access-list 104 permit icmp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255 echo-reply
access-list 104 permit udp 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255
access-list 104 deny   ip 10.1.1.0 0.0.0.255 10.1.3.0 0.0.0.255
access-list 104 deny   ip 10.1.1.0 0.0.0.255 10.1.4.0 0.0.0.255
access-list 104 deny   ip 10.1.1.0 0.0.0.255 10.1.6.0 0.0.0.255
access-list 104 deny   ip 10.1.1.0 0.0.0.255 10.79.0.0 0.0.255.255
access-list 104 permit ip any any


interface Vlan204
 description UsersEast
 ip address 10.1.1.1 255.255.255.0
 ip access-group 104 in
 ip helper-address 10.1.200.16
 ip flow ingress
 ip route-cache flow

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Asked On
2009-11-03 at 07:57:54ID24867531
Topics

Network Switches & Hubs

,

Network Routers

,

Networking Hardware Firewalls

Participating Experts
3
Points
500
Comments
10

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Answers

 

by: surbabu140977Posted on 2009-11-03 at 08:01:28ID: 25730272

entering the subnet from somewhere........

 

by: dtadminPosted on 2009-11-03 at 08:03:20ID: 25730295

ok. so then my acl is written backwards???? 10.1.3.0/24 is another VLAN. Should my syntax be "ip access-group out"?

 

by: surbabu140977Posted on 2009-11-03 at 08:08:08ID: 25730366

we generally do not use out. rather use "in" at the other vlan.

If traffic is going out from vlan X to vlan Y, rather than putting OUT in vlan x put IN at vlanY.



 

by: nasirshPosted on 2009-11-03 at 08:08:51ID: 25730375

No you will do the same thing by chaging the Access-List and applying it the same way using ip access-group XX in

 

by: surbabu140977Posted on 2009-11-03 at 08:10:12ID: 25730390

btw, your acl is in correct order....... *In*

from 10.1.1.x traffic will enter your subnet and get filtered by ur *in* acl and will go out.......

 

by: dtadminPosted on 2009-11-03 at 08:12:16ID: 25730416

so as it is written it is correct? I din't need to change anything.

What about taking the ACL off of VLAN 104 and putting it on VLAN 207 which is my 10.1.3.X network?

 

by: surbabu140977Posted on 2009-11-03 at 08:15:27ID: 25730460

Forgot, I guess you need to use vlan map foir using ACL, by default simply putting the ACL won't work in vlan..........

 

by: dtadminPosted on 2009-11-03 at 08:16:23ID: 25730475

Sounds like the way I have it is working. Maybe I will just not change anything?

 

by: surbabu140977Posted on 2009-11-03 at 08:18:05ID: 25730497

it's nice then...... but thanks for raising the doubt.... :) need to investigate a bit for myself  about the vacl.....

 

by: rochey2009Posted on 2009-11-03 at 08:21:26ID: 25730539

ip access-group in

is applied to traffic leaving the subnet.

20120131-EE-VQP-002

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