Questions tagged [interface]
For questions about a physical or virtual interface on a network device. For instance: Interface configurations, troubleshooting and security.
175
questions
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22
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What’s the difference between Intel XXVDA2 and XXVAM2? [closed]
I have been looking at 25GBit NICs for SFP28 transceivers and came across the Intel XXV710 cards.
Since I couldn’t figure out the naming scheme of these NICs, I have no idea what the difference is ...
- 137
1
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1
answer
130
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Command for interface uptime
Is there any command to find out how long a particular interface has been up on a cisco switch ?
- 33
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1
answer
109
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VLAN routing on the same subnet
Consider following situation:
You have 10.3.0.0/16 network without any VLANs. Now You want to divide it...
You want Your IT department be able to reach the entire network, but sales department only ...
- 3
4
votes
1
answer
290
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Copying IOS from TFTP problem
I have a Cisco 4503 switch that had its IOS completely wiped. I have managed to boot from TFTP. the instructions I have tell me to switch the ethernet cable from the management port to a standard 10/...
- 41
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2
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147
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Question about subinterface DHCP relay CISCO
I want to make 4 PC got DHCP IP address
No problem with left side, but right side 2 PC can't get IP automaitic. I think the problem is DHCP Relay.
How can I use ip helper-address for subinterface of ...
1
vote
2
answers
78
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What's the different between a "mask" in route table and interface?
if we took Windows as an example, we can use the command "netstat -rn" to show route table as follows:
IPv4 Route Table
===================================================================...
- 113
2
votes
1
answer
353
views
Unable to disable CRC check on Cisco 2960-X
I have a 48 port Cisco 2960-X running IOS Version 15.0(2)EX5.
I'm trying to connect it to a Ubiquiti EdgeRouter4 using a Ubiquiti DAC Twinax cable..
I'm aware that this is technically not recommended, ...
- 123
2
votes
2
answers
139
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Unable to add an abbreviated IPv6 to a Cisco router
I am very new to networking and playing around with GNS3. I am trying to configure a router to have 2 IPv6 addresses in a single interface (as far as I understood, this is possible with IPv6)
I ...
- 135
0
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2
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170
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Is It possible to make Router On A Stick with two physical interfaces in the router?
If we try to implement router on a stick (ROAS) for try interVLAN communication, we must to use one Phisical interfase and split it into several "logicals" interfaces. Until Now all right.
...
- 105
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votes
2
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527
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can LAN port have multiple IP addresses of same subnet mask or different subnet mask
Can the router's ethernet interface have multiple IP's of the same subnet or different subnet mask?
If yes what's the use?
- 11
1
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2
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342
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What does network interface do? and what's difference between a network interface and a network interface card (NIC)?
I'm a little confused about the network interface. Based on my understanding, a network interface does the translation between link-layer and internet layer, and does the ARP. Is that right?
Also what'...
- 11
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2
answers
205
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Adding Second Interface with Different Public IP for Same Internet Connection
We have a situation that I'm not sure how to proceed correctly.
This location is currently utilizing two different firewalls - a Sophos XG 310 and a Sonicwall NSA 3500. The way this was originally ...
1
vote
2
answers
70
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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 ...
- 151
0
votes
1
answer
38
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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 ...
- 11
0
votes
1
answer
1k
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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 ...
- 1,058
2
votes
0
answers
911
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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 ...
- 1,058
0
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1
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180
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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 ...
- 133
0
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1
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48
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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 ...
- 103
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2
answers
132
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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....
- 7
1
vote
1
answer
415
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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.
...
- 90
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1
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581
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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 ...
- 1
0
votes
1
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4k
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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 ...
- 45
1
vote
2
answers
55
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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?
- 127
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2
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2k
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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 ...
- 4,247
1
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0
answers
30
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,
...
- 11
2
votes
1
answer
2k
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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 ...
- 136
0
votes
2
answers
31
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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? ...
- 109
2
votes
2
answers
331
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 ...
- 521
0
votes
1
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106
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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 ...
- 68
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1
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41
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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
1
answer
707
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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 ...
- 1,128
0
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0
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82
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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 ...
- 115
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votes
1
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99
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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
...
- 671
3
votes
1
answer
128
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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? ...
- 671
2
votes
2
answers
7k
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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, ...
- 861
4
votes
2
answers
188
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
3
answers
2k
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:
...
- 45
5
votes
2
answers
2k
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: ...
- 1,737
1
vote
2
answers
58
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?
- 133
4
votes
1
answer
432
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 ...
- 565
0
votes
2
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143
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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, ...
- 416
4
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2
answers
3k
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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 ...
- 4,247
3
votes
1
answer
635
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 ...
- 1,505
3
votes
2
answers
368
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
...
- 1,505
2
votes
1
answer
155
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, ...
- 1,505
0
votes
1
answer
56
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.
- 1,505
2
votes
2
answers
735
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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;
...
- 123
1
vote
2
answers
378
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 ...
- 15
3
votes
1
answer
113
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)?
- 313
4
votes
3
answers
539
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 ...
- 313