Questions tagged [interface]
For questions about a physical or virtual interface on a network device. For instance: Interface configurations, troubleshooting and security.
165
questions
1
vote
2answers
53 views
Basic conceptual questions about network interfaces
I have some basic questions as I am trying to understand the concept of network interfaces a bit better.
Is network interface same as network interface card (NIC)? If not, what's the difference.
What ...
0
votes
1answer
22 views
issue regarding broadcast mac address
I read a line saying {Routes do not forward packets coming from one interface having broadcast mac address
(FF:FF:FF:FF:FF:FF)}
what is meant by one interface in that line?
if router cannot broadcast ...
0
votes
1answer
95 views
Understanding the Burst Size against policer for 1G/10G interfaces in Juniper MX
We are facing one confusion with regards to burst size value against rate limit or policer in Juniper MX. Need to understand two things :-
(1) Is the burst size limit defined in firewall policer ...
2
votes
0answers
66 views
10G Interface on Juniper MX Stops Transmitting Output Optical Power
We have been facing an issue on Juniper MX series router. We have 10G interface on our router. Its does not matter whether interface is connected to DWDM or interface itself is a dark fiber. The end ...
0
votes
1answer
36 views
Accessing an interface range that spans beyond one stack on a Cisco Switch
I want to configure Interfaces 0/3, 1/2 and 1/3 for example. Using interface range gig 0/3-1/3 did not work, is it simply not possible or is there a different syntax?
EDIT: Of course aside using ...
0
votes
1answer
29 views
Routers FastEthernet interface clock autonegotiation protocol
In routers, for serial interfaces, we need to manually set the clock at the DCE router so that the ends of the connection can communicate. I know that in this way we are using time-division ...
0
votes
2answers
98 views
I still can't understand how routers work
I've seen a topology that has 1 router for each network, for example:
Network1: 192.168.1.0
192.168.1.2/24 PC1 ->
192.168.1.3/24 PC2 -> 192.168.1.5/24 SWITCH -> 192.168.1.1/24 ROUTER
192.168....
1
vote
1answer
117 views
VLAN Subinterface Removal - CISCO ASA
The below are the configuration of the subinterfaces in Cisco ASA firewall and currently sub-interface 0/1.1 is only passing traffic and I need to remove 0/1.2 configuration from here as it is unused.
...
0
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0answers
52 views
Cisco Router Interface Connection Problems
I am new to networking and am configuring, I am trying to setup my connections in packet tracers for 3 different routers to talk to each other over Serial ports as attached.
However, I did notice ...
0
votes
1answer
125 views
Multiple mac adrress on one cisco switch interface
How can i config Multiple mac address on one cisco switch interface?
(I have 3 laptops and i connect only one laptop every time(I switch between them), and i want to config only one interface with the ...
0
votes
1answer
1k views
JunOS: FPC Major error alarm
I hope everyone is doing fine!
This morning I've run into a problem. My uplink interface went down for unknown reasons.
Upon checking system alarms I see this:
show system alarms
1 alarms currently ...
1
vote
2answers
46 views
Steps on troubleshooting a network
If I have to troubleshoot a network stating that one of the interface is
not working (i.e, a link is down), what steps would I need to take to make it
working again?
0
votes
2answers
634 views
Fiber dBm transceiver power level at warning
We have cisco nexus 9000 and one of 40G interface showing port transceiver power level at warning when i check on command line i found following.
Question:
what is the normal power level for ...
1
vote
0answers
29 views
Change name interface [closed]
Sorry for my English....
I want to change the interface name, what I don't know sure the steps....
First I should know my interface name and mac from it,
ip a
Seconds, down my NetworkManager,
...
2
votes
1answer
821 views
Link Aggregation from Cisco to Palo Alto using 10 gig interfaces, port on Cisco shows “waiting to be aggregated”
I am trying to bundle two 10-Gig interfaces on PA-3020 to Cisco Cat9300. Previously, I had bundled two Gigabit interfaces on same devices and everything worked fine. But now, when I try to configure ...
0
votes
2answers
31 views
Cisio interface naming rule
I'm very new to networking. I noticed in GNS3 lab environment, if I want to configure IP address for an interface of a router, I can use int f0/0 or int fastEthernet 0/0. What's the naming rule here? ...
2
votes
2answers
206 views
Relationship between full duplex and speed
Full-duplex data transmission means that data can be transmitted in both directions on a signal carrier at the same time. but my question is if we have an interface with 100Mb speed and full-duplex ...
0
votes
1answer
45 views
Bandwidth limit between CPE and Provider Equipment
I have 4 different WAN links for redundancy one of them is 15mbps MPLS and the other ones are 30mbps Internet , 50 mbps Internet and 10 mbps MPLS , the way that it is set up is that we have load ...
0
votes
1answer
35 views
Can't access services on my other IP on same network interface GNS3 and Host [duplicate]
I have one physical NIC that is assigned an IP address (10.14.255.240). Inside of GNS3 network simulation tool, I also have a another 'virtual' interface with another ip address (10.14.255.245). Both ...
1
vote
1answer
372 views
Why a NIC in promiscuous mode and not will impact the capture packages?
I have a question about network interface Promiscuous mode,
A NIC in promiscuous mode can receive all data passing through it regardless of whether the destination address of the data is it. If the ...
0
votes
0answers
56 views
Brocade XMR randomly losing virtual interface IP address
We have a pair of XMR routers configured 100+ VLANs running VSRP downstream and BGP upstream. At random times, the IP information is deleted and I have to go in and reset it.
Each VLAN config looks ...
0
votes
1answer
73 views
Static IP assignment 3750X - DHCP Override
I have a 3750X that I am running some testing with. I have a VLAN interface that is using 10.10.10.254/21 as it's primary IP and 192.168.10.254/24 as it's secondary IP. See below:
interface Vlan10
...
3
votes
1answer
125 views
Switching interface VLAN ID Mid-Production
I was wondering if there was a way to switch out the VLAN ID from VLAN1 to VLAN10 without impacting the connectivity of the end users? Can I simply copy and paste from one interface VLAN to another? ...
2
votes
2answers
4k views
What is the purpose of a switch routed port?
From my Cisco CCNA documentation:
Routed ports are used for point-to-point links. Connecting WAN routers
and security devices are examples of the use of routed ports. In a
switched network, ...
4
votes
2answers
143 views
Serial interfaces of router are used nowadays?
I've heard the use of serial interfaces of router is not so common in the current network environment.
But in some exams like CCNA, you can still see questions including the knowledge of serial ...
4
votes
3answers
647 views
JunOS, access mode interface asks for a vlan
I'm kinda new to networking so I'm going to do my best to try explain my issue.
The issue that I have is that I want to delete all default configuration for my xe interface.
Current configuration:
...
5
votes
2answers
1k views
What's the `line protocol` and `Link`?
When I show a switch interface information, there are line protocol and Link:
Switch-A(config-if)# show interface gigabitethernet 0/3
Gi0/3 up, line protocol is up (connected)
Bridge Port Type: ...
1
vote
2answers
56 views
Configuring routers on Cisco
If I have three routers R1, R2, and R3 that are interlinked, then when configuring, do I have to give the command:
description Link to R2
description Link to R3
when configuring R1?
4
votes
1answer
384 views
Which physical interface would be used to send/receive packets intended for a loopback interface?
Let us say, I have configured the managed router with a loopback addresses -
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 ...
0
votes
2answers
120 views
Cisco Catalyst pseudo interface?
I think I remember reading somewhere that you could have multiple VLANs assigned to a single interface by way of a pseudo interface. Googling with that vocabulary doesn't return proper results though, ...
4
votes
2answers
2k views
Cisco ASA 5585X Internal-Data0/1 interface errors
I have noticed on Cisco ASA 5585 (SSP-20) interface error counter going up specially overrun but so far we haven't seen any production impact or issue, error rate is low so its not noticable but would ...
3
votes
1answer
326 views
Is a network interface supposed to have no more than one MAC address?
Is a network interface supposed to have no more than one MAC address?
Since a network interface is free to have more than one IP addresses, is IP address a way of multiplexing MAC address, if a ...
3
votes
2answers
347 views
Do the concepts of IP address and network interface not belong to the same layer?
https://unix.stackexchange.com/a/508065/674
You are confusing the device driver layers and the IP layers of the
stack.
At the IP layer, 127.0.0.1 is just another IP address and treated the
...
2
votes
1answer
99 views
What can an IP address be assigned to?
What can an IP address be assigned to?
A network interface, which is what I thought originally. (I seem to hear a network interface can have multiple IP addresses assigned to it, and if it is true, ...
0
votes
1answer
40 views
Can more than one IP addresses be assigned to the same network interface?
Can more than one IP addresses be assigned to the same network interface?
Is it correct that a network interface can be a physical one or a virtual one?
Thanks.
2
votes
2answers
259 views
Junos[MX]: How to show VPLS instance associated with given subinterface
Suppose I have a subinterface with Vlan-vpls encapsulation, like this one:
admin@router> show configuration interfaces ge-2/1/1
flexible-vlan-tagging;
encapsulation flexible-ethernet-services;
...
1
vote
2answers
238 views
Get DHCP IP with subinterface
Router0 has 1 subinterface on gi0/0 and can't get a ip trough dhcp. Is there something I forgot?
The configs:
Router0(got no ip from dhcp):
interface GigabitEthernet0/0
ip address dhcp
duplex ...
3
votes
1answer
98 views
DHCP Broadcast on SVI
Think of a dhcp broadcast going through multiple switches. What happens to that broadcast when it reaches the vlan interface (svi)?
4
votes
3answers
381 views
Mgmt Vlan vs other SVI s
Think of a layer 3 switch. Assume that we have a management vlan and a mgmt vlan interface. And we have other svi's on the switch. The question is this. I know that mgmt vlan is for telnet/ssh, simply ...
2
votes
1answer
113 views
Wireless Controller 5520 Creating a dynamic interface
I'm hoping to determine the least intrusive way to configuring my WLC.
I am working through the GUI interface and have created a new dynamic interface
[Controller-> Interfaces]
When I went to ...
4
votes
3answers
824 views
What is responsible for dropping Layer 2 frames that's not addressed to it?
It's my understanding that if a network interface card (NIC) receives a Layer 1 packet, it will extract the Layer 2 frame from it, checks its destination MAC address, and if it is not addressed to it (...
6
votes
2answers
1k views
How does a router know the MTU of a network?
I've done several exercises where you're given the MTU of a net or subnet, but I wonder how routers know the MTU of the nets they're connected. I've learnt that in OSPF protocol this information is ...
0
votes
1answer
114 views
Can not add a Physical port into LAG
Using SuperMicro network module, which related to Intel SDN product,
the command PDF . and the Web GUI manual.
there I have qe57, qe61, qe65, qe69 four upstream ports, I want to aggregate them to one ...
2
votes
1answer
699 views
Urgent: how to configure different interface using same ip subnet in asa 5506?
Scenario is in old asa firewall 5505 I have switch port access vlan command in different interface. Just like below:
interface Ethernet0/0
!
interface Ethernet0/1
switchport access vlan 2
!
...
0
votes
1answer
26 views
i cant configure the ip adress and subnetmask ,i only have one router “1941” and 2 pc's
the command line is this :
Router0(config-if)#ip adress 192.168.1.1 255.255.255.0
the error message is :
% Invalid input detected at '^' marker.
0
votes
1answer
573 views
How to create interfaces for CSR 1000v for GRE tunnels?
Well, my idea is to connect to 4 CSR 1000v routers in different VPC (without VPC peering).
I've basically finished with everything with the pre-configuration creating VPCs, subnets IGW, modifying ...
1
vote
1answer
70 views
Multiple Networks on Sonicwall with no access to cisco firewall
The issue im having is that i have 2 networks with 2 internet connections. We now all of a sudden have a POS system handling our network. This system blocks our email and a bunch of pages we use. They ...
2
votes
2answers
985 views
How can two interface communicate between them with different subnet
R1 and R2 are connected with serial cable interface but both of them having different subnet and i know they will not communicate so what are other options two communicate between them without the ...
1
vote
1answer
255 views
What's the relationship of a Router with its loopback interface in logic?
I have a Router1 with a loopback 0 connected to the Router2:
the interface brief is bellow:
Router1>show ip interface brief
Interface IP-Address OK? Method Status ...
1
vote
2answers
282 views
How to use“ Multimode SFP GLC SX MMD” in Cisco Catalyst 2960 S connected LAN and single mode OFC network
We have single mode OFC network and CAT 6 CAT5 LAN with ethernet and gigabit Ethernet switches and ordered for "GE SFP, LC CONNECTOR LX/LH TRANSCEIVER FOR SINGLE MODE FIBER OF CISCO CATALYST 2960 S" ...
