Datagram.Network
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Ethernet padding value
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7 votes

IEEE 802 packets may have a minimum size restriction. When necessary, the data field should be padded (with octets of zero) to meet the IEEE 802 minimum frame size requirements. This padding is not ...

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Subnetting of a /24 network due to using VLANs
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6 votes

Is not gonna work as: 10.97.21.32/25 is part of 10.97.21.0/25 network which is overlapping with your 10.97.21.0/27 10.97.21.160/26 is part of 10.97.21.128/26 which is overlapping again with other of ...

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Does a Business Router from an ISP perform actual routing or only Network Address Translation (NAT)?
4 votes

Of course it does, it route packets from A to B. Usually home routers only have a default route, but this doesn't mean that they don't route packets. Their routing table is just smaller with one ...

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How do behave the AP during monitoring mode?
4 votes

Monitor Mode provides constant channel scanning with attack detection and forensics (packet capture) capabilities. Capture packets regardless of connected network. No association to AP needed (and no ...

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How does data send in DSSS with different range of frequencies?
3 votes

Please see below: "The original 802.11 standard used an 11 chip Barker code modulation. For each data symbol, an 11 chip sequence is transmitted. The symbol rate is 1 Ms/sec, so the chip rate ...

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Show RAM usage Cisco 2960
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3 votes

You can try to use command: #show proc mem you will get output like: Processor Pool Total: 43953664 Used: 12967924 Free: 30985740 I/O Pool Total: 8388608 Used: 2998796 Free: ...

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Is it possible to create a collaborative network?
3 votes

There are a lot of solutions on market. I would check if any of your local ISPs support line bonding. That would be ideal option.

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Is mac address aging just for dynamic/sticky mac addresses?
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3 votes

You can configure an interface to convert the dynamic MAC addresses to sticky secure MAC addresses and to add them to the running configuration by enabling sticky learning. To enable sticky learning, ...

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Can't ping Linux hosts on a certain subnet unless core router pings them first
3 votes

CAM and ARP table are populeted while you ping from 4500. Is just aging faster from CAM than from ARP. If you would wait 4 hours it would time out as well from ARP. Is those 4500 clustered? If yes I ...

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Wireshark - How to find cause of incomplete download
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3 votes

You can use source and destination filter in wireshark: ip.src==192.168.0.1 and ip.dst==192.168.0.2 if it's http you can add filter: tcp.port == 80 or tcp.port == 443 for ssl. When you find your ...

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Really Invisible WiFi (not just hidden)
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3 votes

Hi WiFi network as it names says is wireless, you can't hide it. There is few options you can do like disable beacon frame broadcast. Than you won't be able to discovery network SSID. But packets ...

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In what case should the core router having iBPG configured or having routes redistributed via OSPF to it?
3 votes

If R1 and R2 holds full internet routing table answer is never. Only default route should redistributed towards OSPF in some occasions maybe you would need to redistribute certain prefixes into OSPF ...

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n3k pause frame issue
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2 votes

This is the normal operation of Link Level Flow Control. If there is congestion on link pause frame will be sent which halts the transmission of the sender for a specified period of time. I think ...

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RIP Routing for subnets within the same class C network?
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2 votes

I assume you are using RIPv1, RIPv1 uses classful routing so you won't be be able to use variable-length subnet mask (VLSM). Try RIPv2, which uses Classless Inter-Domain Routing.

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Handling high number of concurrent GSM device connections
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2 votes

Standard BTS (with 3 cells) can handle around 9 erlangs which is enough to support circa 1500 subscribers, but everything depends. All station are built to suit terrain and people density on given ...

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i want to pass the traffic vlan traffic through already established IPSec tunel
2 votes

You can use OTV, L2TP or VXLAN.

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Is this topology loop free?
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2 votes

Switch uses Layer 2 Spanning Tree Protocol to ensures a loop free topology for any bridged Ethernet network. So if yours IOT device will forward bridge protocol data unit (BPDU) accross, switch will ...

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MST region and CST virtual bridge priority
2 votes

CIST Root Bridges Election Process When a switch boots up, it declares itself as CIST Root and CIST Regional Root and announces this fact in outgoing BPDUs. The switch will adjust its decision upon ...

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SRX FW - Show route - output reject
2 votes

Most common reasons to reject route on local interface is: interface with assigned IP is down/disabled there is IP conflict and this IP is assigned in two places, could be even on unused interface ...

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Where to plug the Firewall into the SFP or a normal port?
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2 votes

USG20 supports 1Gbps so I would connect to SG220 over one of two GigabitEthernet Ports which are usually used for uplinks next to port 0/23 and 0/24. Unfortunately USG20 doesn't support LCAP/PaGP so ...

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Fast Retransmit
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2 votes

Full process in details is described in RFC 2581 3.2 The fast retransmit enhancement works as follows: if a TCP sender receives a specified number of acknowledgements which is usually set to three ...

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Multi-switch configuration with double uplink
2 votes

Is not gonna work that way unless you have stacked switches and ether channel/bundle or VPC configured on both switches to servers. Which not all switches support. Server usually don't take part in ...

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Stateless firewalls
2 votes

There is need for output and input rules. A stateless firewall filter, also known as an access control list (ACL), does not statefully inspect traffic. Instead, it evaluates packet contents statically ...

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How to reliably see VLAN tags on a client?
2 votes

Windows has no built-in support mechanisms for VLANs. There aren't separate physical and VLAN interfaces you can capture from, unless a specialized driver that adds such support is present. ...

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ping -r results are confusing
2 votes

ping -r adds RECORD_ROUTE flags in packet which many hosts ignoring this flag. Is not recommended tool to check path route. I would use instead traceroute or mtr. And is only supporting up to 9 hops. ...

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How do I generate ESP trafic (IPv6)?
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2 votes

Packet which is sent from and to protected subnets will be encapsulated by strongswan. If traffic is not matching criteria won't be encapsulated. Try to generate ping from interface which is included ...

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Why use subnet mask /30 for the internet port of the edge router?
1 votes

The /30 subnet mask provides the most efficient use of IP addresses by not wasting any IP addresses when it is applied to a point to point network connection.

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How is traceroute able to display hostnames?
1 votes

Traceroute does use Reverse DNS lookup or reverse DNS resolution (rDNS). Querying technique of the Domain Name System (DNS) to determine the domain name associated with an IP address. The process of ...

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Connect to the switch console port, type the keyboard I will get messy code
1 votes

Serial port settings mismatch. Please set serial setting as below: Baud rate—9600 Flow control—None Data—8 Parity—None Stop bits—1 DCD state—Disregard

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Why are WLAN packages translated to Ethernet packages by Wireshark?
1 votes

Because 802.11a/b/n/g are standards defined on physical layer, framing staying same as in ethernet on above layers. Wireshark usually captures at the link layer so it's why you see Ethernet frames. Is ...

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