Questions tagged [acl]
Discussion on Access-Control-Lists (ACL) or Access-Control-Entries (ACE)
228 questions
3
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1
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ACL and PBR on Cisco Nexus
I have a Cisco Nexus switch that I'm using as my core router. It has a connection to a firewall that handles internet-bound traffic. The switch acts as the default gateway with a default route to the ...
- 33
0
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1
answer
46
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IP Assignment for applying ACL on Cisco Nexus3500 C3548P-10GX Chassis
Context
Following are the details of the layer-3 switch
cisco Nexus3500 C3548P-10GX Chassis
Intel(R) Core(TM) i3- CPU @ 2.50GHz with 16396528 kB of memory.
Processor Board ID FOC25244X6C
We have ...
- 103
0
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1
answer
79
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How to combine port forwarding and NAT/PAT on Cisco router?
I have a problem, that I cannot bring together working PAT and Port forwarding on a Cisco router.
Here is my topology:
Explanation to topology:
Start connection sourced by 192.168.1.1 with ...
- 1
0
votes
1
answer
175
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How to Configure ACL in subinterfaces
"Guys, I am having trouble configuring a Cisco network. I have a router with three configured sub-interfaces."
interface GigabitEthernet0/1
ip address 20.0.0.1 255.255.255.0
duplex auto
...
0
votes
0
answers
27
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SONiC OS. ACL for ip of vlan interface L3
I'm trying to apply simple acl rules to IP address vlan100, but it always responds to ping.
"VLAN100_ACL": {
"policy_desc": "VLAN100 Ingress ACL",
"type": &...
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1
vote
1
answer
135
views
Access list and interface vlan
Pleasae I am facing this problem, the ping is always successful from 10.16.13.2 to 192.168.0.3
even if Iam configuring the acl in the 'in indirection'.
show ip access-list
Extended IP access list ...
- 51
0
votes
1
answer
148
views
ASA cannot get traffic to pass port forward
I'm not able to get port forwarding to work for some reason on my asa 5555-x.
I have tried the below config:
!
object network SERVER
host 192.168.1.20
!
object service SERVICE_TCP_9982
service tcp ...
0
votes
1
answer
45
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ACLs block connection
Here is my configuration on ISP router:
interface GigabitEthernet0/0/0
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/0/0.10
encapsulation dot1Q 10
ip address 192.168.10.1 255....
- 27
1
vote
2
answers
1k
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Exclude a certain vlan/subnet from layer3 inter-vlan routing
We have new gen aruba (hpe) switches in our environment.
There is a backbone (5412R zl2) which all edge switches are connected to. The edge switches are also layer 3 (2930F). The backbone delivers ...
- 137
1
vote
2
answers
67
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Huawei Cloudengine 6851 ipv6 acl not matching
I have a Huawei 6851 and this is my config
acl ipv6 number 3006
description MY-IPv6
rule 10 permit ipv6 source 2001:x:x:x::x:x/112
rule 20 deny ipv6 destination 2001:x:x:x::x:y/128
rule 30 permit ipv6
...
- 721
0
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1
answer
254
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Blocking traffic means can't access that server?
I know this is a super newbie question.
I recently learn about firewall and you would know there is security levels.
The higher levels can send the traffic but cannot get it from the lower one.
I am ...
0
votes
1
answer
712
views
Cisco router access list not working as expected
I'm trying to set up a network in packet tracer with inter-VLAN routing. I need to restrict one of the VLANs to only accept traffic from the 172.25.30.0/24 network.
To do this I am using an access ...
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5
votes
3
answers
5k
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Difference between firewall and ACL
I have found many answers to this question, none of which satisfy me due to lack of detail.
Can someone please explain in detail what is a firewall and what is its purpose, and what is an ACL and what ...
- 151
1
vote
1
answer
363
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Inherent flaw in stateless firewalls?
I am but a lowly (software) developer dabbling with setting up a network in AWS and am having trouble understanding the fundamentals of stateless firewalls, or Network ACLs as they're also referred to ...
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1
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0
answers
108
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TACACS Through ASA L2L Tunnel
Hello see below network diagram.
I am trying to configure the Branch Router (10.1.1.1) to use TACACS AAA on the HQ-AAA-Server host (192.168.10.10). TACACS works fine for the Branch-FW1 ASA device ...
- 171
1
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1
answer
886
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Access TACACS+ Server through ASA
I am trying to set up TACACS+ for a project. The below image shows the layout of the network.
So far I have the TACACS+ server set up and working (HQ_AAA_SERVER) and it works fine for authentication ...
- 171
2
votes
1
answer
652
views
Cisco ASA Clientless SSL VPN Restrict Network Access
I'm working on a Uni project to set up a secure network. One aspect is to have a VPN for clients of the imaginary company to access web based services.
I have set up a simple clientless SSL VPN which ...
- 171
1
vote
1
answer
197
views
Configure AAA on a router - Extended ACLs
How do I write a named extended ACL which will allow for traffic between a DNS from a LAN (IP address) to a DNS server at (IP address), ping from a host PC (IP address) to any destination and allow ...
1
vote
1
answer
141
views
What's the procedure to limit a subnet on a Cisco router from seeing another subnet when both are using NAT?
I have a Cisco 891F router. The internet is hooked up to G8. The student network is Vlan 200, and the Office is Vlan 100.
(I know the internet has an internal subnet (192.168.1.5), but that's because ...
- 113
4
votes
1
answer
893
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Correct ACL rules to isolate WiFi traffic from other VLANs?
I have written ACL rules written for a Dell PowerConnect 8024F (which, for the most part, uses the Cisco ACL "language") to isolate WiFi traffic from the rest of the network but allow the ...
- 176
0
votes
2
answers
199
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Cisco ASA access-lists and net config
Here are my config to this network. I found the ASA doesn’t ping through each other. Also, when I type show crypto isakmp SA and IPSec Sa, it doesn’t show anything at all. Could you guys find what’s ...
0
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2
answers
95
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Cisco MAC ACL loop holes
I know this is not a new topic but need to clarify a couple things.
I have a typical office with hosts connected to a Cisco 3560-X in same VLAN.
My goal is to prevent unauthorised hosts ever accessing ...
1
vote
0
answers
36
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ACL dont work - MASTER VLAN to see ALL OTHERS BUT NOT VICE VERSA [closed]
I am having a bunch of VLANS that are in our HQ. Idea is that only several subnet must see IT department VLAN and all others DONT but IT department must see all vlans.
I tried like this, to make all ...
- 11
0
votes
1
answer
3k
views
How do I apply an access list on a switch?
I'm configuring a very small network on packet tracer 8.0 and I have a single 2960-24TT switch which is connected to 2 PCs and 1 router. Everything is on the 24.17.2.0/24 network and I added a VLAN. I ...
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3
votes
1
answer
312
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Cisco ACL numbering
This is a small technical question. I can't seem to find any information on this, so I thought I'd ask here.
I'm currently studying for my CCNA and I'm currently on the topic of ACLs. On IOS standard ...
- 133
1
vote
1
answer
602
views
How to block telnet access for one particular network from all networks except one using Extended ACL
Scenerio is given in the picture. I want to block all the networks except 192.168.5.128/25 from doing telnet of 192.168.5.0/25.
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1
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0
answers
147
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Access-class in denies telnet under specific configuration
So I created an Access-list to permit telnet from a specific subnet. Here is the network diagram.
I originally tried permitting the subnet 10.1.1.0 /24 to access the R4 vty lines 0 4. It was a ...
- 69
0
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0
answers
245
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Allow one way SSH on extended IP access list on Cisco switch
interface GigabitEthernet1/0/11
ip access-group VM01-BLOCK-SSH-ACCESS-OUT out
objective:
10.10.10.104 -x-> any 10.10.10.0/24 via SSH
any 10.10.10.0/24 via SSH ---> 10.10.10.104
Question: ...
- 526
0
votes
1
answer
514
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Cisco L2 switch port ACL options
I'm trying to understand Cisco Switch ACL options I can potentially use to limit traffic. Switch is a IE2000 series with Lanbase IOS. It is L2, with trunk port to uplink switches, multiple VLANs on ...
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1
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1
answer
494
views
Access list command for specific IP range in Cisco Router 1921
For example:
router(config)#ip access-list extended 101
router(config-ext-nacl)#10 per icmp any host 192.168.1.10
From second command line, how to write a command permit icmp any host range 192.168.1....
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1
vote
1
answer
303
views
VLAN Filtering not working
On Cisco devices I'm looking to enable some filtering for one specific vlan (id 110).
Here is my config : (192.33.57.177 is the DHCP server host)
ip access-list extended VLAN110-DHCP
permit ip any ...
- 787
0
votes
1
answer
934
views
Blocking 2 VLANs from accessing a specific VLAN on a network
I'm working on a project in packet tracer and I have a server connected to VLAN 10.
VLAN 10 has a single server device on it and the IP scope is a /30.
I have 8 other VLANs across 2 sites. The 2 ...
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0
votes
2
answers
63
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meaning of acl configurations?
how do we know what ACL configuration mean? an example access-list 89 permit tcp host 192.168.10.2 any eq www? does this allow the traffic from the host 192.168.10.2 inside? i'm a bit confused. any ...
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0
votes
2
answers
564
views
When do ACLs on SVIs get applied on Cisco Catalyst devices?
I don't understand exactly when an ACL will get applied when on an SVI. Given the following (pseudo) configuration
int vlan 100
ip address 10.0.0.1 255.255.255.0
ip access-list in in
ip access-...
- 165
0
votes
0
answers
380
views
Juniper MX Routing Engine Firewall Filter
I'm having difficulties with something I initially thought would be rather simple. I need to apply an outbound firewall filter on an MX10003's management interface. I'm currently using Lo0.0 as the ...
- 157
0
votes
3
answers
489
views
Egress filtering by blocking unused ports
Our company wants to block data exfiltration. They want to control outbound traffic going out from unused ports. I did traffic flow analysis at our edge firewalls to know which ports are used by our ...
0
votes
2
answers
6k
views
Permit ping and traceroute and deny all other services using an ACL
my topology is shown below:
I would like the networks that are connected to Hermes-Router to be accessible from all the other stations only when I use ping and traceroute. I tried to do this using an ...
2
votes
0
answers
162
views
How to configure an ACL on ASA when the inside source IP address is translated by NAT? [closed]
I don't know how to configure an ACL when inside source nat is enabled.
In my example, I want to realize bidirectional communication with TCP port 30000 between 172.16.100.100(inside) and 10.10.10.10(...
1
vote
1
answer
2k
views
DNS expire-entry-timer has negative affect on ASA using FQDN ACL
I have a Cisco ASA using FQDN egress ACLs for a host that changes IP addresses every 10 mins (Apple APNS IP address pool). As soon as the TTL expires for the addresses, my internal server requests a ...
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4
votes
1
answer
4k
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Cisco Nexus 9300 TCAM carving
I have Cisco Nexus C9396PX L3 switch and i have configured bunch of ACL (inbound) on it to deny/permit traffic. now if i am trying to add more ACL then getting error that your TCAM table is full. here ...
- 4,389
3
votes
2
answers
1k
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Restricting TFTP access from Host to Router using extended ACL in Cisco IOS
I am trying the below Extended ACLs to restrict TFTP but still I am able to upload files to the router using tftp. Not sure, what is wrong, can you all help?
Approach 1:
permit udp host <ip> ...
- 67
0
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4
answers
1k
views
ACL on routers to block TCP/UDP ports
How routers understand the layer 4 port numbers to be blocked in ACL?
When an ACL to block TCP/UDP traffic with certain port numbers is applied on a router/L3 interface , how will router understand ...
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0
votes
1
answer
264
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N2K-C2248TP-1GE question
We are working with Cisco 2960 and Cisco 4948 switches as our top of rack switches and we want to purchase some N2K-C2248TP-1GE , and connect N2K-C2248TP-1GE to our edge switches, (our edge switches ...
- 721
3
votes
1
answer
929
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delete object network in cisco ASA with packet tracert
I used 5506 as firewall and I am trying to delete object network I created and it gives error as ERROR: unable to delete the object configuration. object (inside-net-obj) is being used.
commands I ...
- 153
2
votes
1
answer
106
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configure IPv6 ACL on interface WS-C3750X-48
I am using WS-C3750X-48 model switch. license is lanbase. I have activated cmd on my switch:
sdm prefer dual-ipv4-and-ipv6 routing. Then i did reload. After that, i will able to config IPv6 on ...
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0
votes
1
answer
68
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Router Standard ACL
I was configuring Standard ACL on router 1841 on Cisco Packet Tracer with the help of command access-list 1 permit 172.16.40.3 0.0.0.0 and access-list 1 deny 172.16.40.4 0.0.0.0 and then I applied ...
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2
votes
2
answers
372
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Nat ACL Question?
I am so confused with fundamentals that I used to be an expert in,
so I have this topology
Please answer to my questions separately,
Question 1) So if I have two DNS severs, and ofc two IP address(81....
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3
votes
1
answer
187
views
Access control on Cisco router with switchports?
I am working with a series 800 router which has inbuilt switchports.
I want to use 2 switchports for a VLAN (say VLAN 100).
On one port will have devices:
192.168.1.10
192.168.1.30
Connected to ...
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0
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1
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715
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how to send tcp packets between 2 hosts on same network
iam using mininet network simulation tool and i need to send tcp packets between 2 host hosts are 10.0.0.1,10.0.0.2 ,i used the hping3 but is sends ip packets also i used this command
hping3 -c 1 [...
3
votes
3
answers
2k
views
How to add multiple ip address in destination ip in acl rule
Iam trying to block a certain host from sending any message to any host in the network
is there is a way to do that or i have to deny host by host ?