Hottest Questions This Month

6

votes

3

answers

1k

views

Why is the BGP base on TCP 1027 rather than 179?

cisco router bgp

modified Nov 29 at 22:13 user754036 6

8

votes

2

answers

816

views

Are ICMP Redirect messages really bad?

icmp

modified Dec 6 at 11:24 JCRM 161

1

vote

4

answers

418

views

Are “ad-hoc” networks always wireless?

wireless ad-hoc-wireless

modified 2 days ago Martin Rosenau 675

6

votes

2

answers

332

views

How to connect a special device in a network

mac-address

modified 2 days ago jonathanjo 10.2k

3

votes

3

answers

482

views

Basic networking and DHCP theory

dhcp lan

modified Dec 7 at 21:46 J.D. Walker 1

5

votes

2

answers

183

views

Carrying remote VLAN via 2 routers to the local gateway

vlan cisco-ios subnet gns3

modified Dec 3 at 12:10 jonathanjo 10.2k

7

votes

1

answer

200

views

Is the first address of the subnet a valid configurable address in case of IPv4 and IPv6 point to point networks?

ip ipv4 subnet ipv6 ip-address

modified Dec 12 at 0:55 Ron Maupin♦ 61.6k

4

votes

1

answer

210

views

Lost Ethertype in encrypted MACsec frames

ethernet security

answered Dec 3 at 19:34 Ron Maupin♦ 61.6k

6

votes

2

answers

97

views

What Cisco will discard TTL=1 packets for own interface?

cisco ipv4 protocol-theory

modified Dec 1 at 18:10 jonathanjo 10.2k

4

votes

1

answer

294

views

Will the data transfer with the destination on the same LAN network be routed through the internet when the WAN IP is used?

routing nat speed

modified Dec 15 at 16:40 jonathanjo 10.2k

2

votes

2

answers

189

views

tcp connection and stream flow question

tcp protocol-theory wireshark transport-protocol tcpdump

modified Dec 11 at 14:26 Ron Maupin♦ 61.6k

4

votes

1

answer

176

views

How does STP convergence work?

spanning-tree layer2 redundancy loop

modified Nov 28 at 20:03 cmatef8 21

4

votes

2

answers

119

views

spanning tree RootGuard question on vPC switches

cisco switch spanning-tree cisco-commands

modified Dec 2 at 1:07 Ron Maupin♦ 61.6k

3

votes

1

answer

146

views

How can a UDP Client and a packet sniffer run on the same machine?

wireshark udp packet-analysis layer4 transport-protocol

modified Dec 14 at 6:21 Ron Maupin♦ 61.6k

4

votes

1

answer

185

views

Whether every router in a AS must have its RouterID?

routing router

modified Nov 20 at 2:54 Ron Maupin♦ 61.6k

2

votes

2

answers

66

views

Public IP addresses

ip ipv4 ping

modified Dec 5 at 23:11 Jens Link 3,728

3

votes

1

answer

131

views

What is wrong with this set of routers?

routing packet-tracer

modified Nov 27 at 20:14 jonathanjo 10.2k

3

votes

2

answers

89

views

L2 / L3 on CISCO ASR

cisco layer2 layer3 dot1q

modified Nov 21 at 17:00 Andrey Prokhorov 1,720

2

votes

1

answer

89

views

single command to gather mac addresses of connected devices to switch

cisco switch

modified Dec 5 at 10:31 Marc 'netztier' Luethi 2,988

3

votes

1

answer

141

views

PAT not translating at all

routing nat cisco-ios troubleshooting

modified Dec 3 at 12:54 jonathanjo 10.2k

2

votes

2

answers

82

views

Calculating the throughput of a given TCP connection

tcp wireshark

modified Nov 22 at 18:20 Zac67 25.2k

1

vote

2

answers

62

views

How can I ping with source option in Cisco Router?

cisco-ios packet-tracer

answered Nov 26 at 21:20 Ricky Beam 21.2k

4

votes

2

answers

46

views

Is there a test/example/dummy SNMP trap OID?

snmp

answered Nov 30 at 6:21 Teun Vink♦ 10.7k

4

votes

1

answer

120

views

Juniper SRX 240 - Routing subsystem not running on secondary node

routing juniper juniper-junos juniper-srx

modified Dec 14 at 20:58 Benjamin Dale 6,359

1

vote

3

answers

54

views

Can I make 2 ISP providers' IP addresses into 1 IP address?

cisco nat isp

modified Dec 4 at 18:40 jonathanjo 10.2k

1

vote

2

answers

69

views

Can large ISPs really offer 1Gb “dedicated” service to every home and business?

internet fiber isp

modified Dec 4 at 15:39 Ron Maupin♦ 61.6k

2

votes

2

answers

87

views

How can two interface communicate between them with different subnet

router interface

modified Nov 29 at 22:28 jonathanjo 10.2k

0

votes

3

answers

39

views

How is traffic forwarded though IXPs if route servers do not forward any traffic

routing bgp internet route-server

modified 1 hour ago Teun Vink♦ 10.7k

1

vote

3

answers

75

views

Why the OSPF router do not have neighbor?

cisco router ospf

answered Nov 20 at 21:38 Sergey Sventitski 1

2

votes

2

answers

58

views

What's the difference between Ethernet link and Serial link?

cisco router ethernet

modified Dec 1 at 18:04 jonathanjo 10.2k

4

votes

1

answer

57

views

Does QSFP+ require 4 fibers?

cisco switch sfp

answered Dec 11 at 18:04 Zac67 25.2k

1

vote

2

answers

73

views

Practical limits of shielded Ethernet cable

ethernet cabling

modified 2 days ago jonathanjo 10.2k

3

votes

3

answers

44

views

Native IPv6 load balancing

routing router ip ipv6 load-balancing

modified Dec 6 at 14:29 Sergey_S 18

5

votes

1

answer

43

views

Is it possible to set up a DSL lab environment?

pppoe adsl lab

modified Nov 21 at 21:18 Teun Vink♦ 10.7k

2

votes

2

answers

70

views

NAT Translation Table Port Number

ipv4 nat protocol-theory

answered yesterday jonathanjo 10.2k

1

vote

1

answer

108

views

When are Native VLANs used? Are there times when a Native VLAN will never be used?

switch vlan switchport

modified Dec 7 at 17:58 jonathanjo 10.2k

1

vote

1

answer

65

views

PVST + MST + RSTP network. Possible to make it work?

cisco spanning-tree networking redundancy pvst

answered Nov 22 at 18:39 Zac67 25.2k

1

vote

2

answers

49

views

Gather the BGP data by using TCP connection on port 179

bgp

answered Nov 29 at 23:55 Marc 'netztier' Luethi 2,988

2

votes

1

answer

131

views

Difference between junos-host zone and a security zone

juniper security juniper-junos juniper-srx traffic

modified Nov 21 at 9:51 Andrey Prokhorov 1,720

1

vote

1

answer

96

views

QOS police vs bandwidth - is this configuration wrong?

cisco switch router qos

modified 2 days ago Ron Maupin♦ 61.6k

2

votes

1

answer

72

views

How to secure an aging PC from the switch/router side?

cisco networking

modified Dec 4 at 17:58 jonathanjo 10.2k

1

vote

1

answer

71

views

Is there any video streaming online service that actually uses UDP?

tcp network udp streaming video

answered Dec 7 at 13:41 Ron Trunk 33.8k

0

votes

1

answer

55

views

It's not showing the DNS why it is called reverse IP lookup?

ip-address dns

modified Nov 30 at 18:25 jonathanjo 10.2k

3

votes

2

answers

70

views

IKE phase 1 and phase 2

vpn ipsec authentication ike

answered Dec 12 at 20:06 Eddie 9,025

1

vote

2

answers

50

views

Why there is only one hop in the tracert?

ip traceroute

modified Nov 20 at 12:46 three-blocks 435

3

votes

1

answer

48

views

Does MACsec (IEEE 802.1AE) support multicast / broadcast?

ethernet security mac

modified Nov 19 at 18:58 Zac67 25.2k

3

votes

1

answer

48

views

Can't ping the management IP of Switch

cisco router subnet ping

modified Dec 3 at 10:48 jonathanjo 10.2k

1

vote

2

answers

101

views

Which first 8 bytes of the IP datagram are included in ICMP message?

icmp

modified Dec 9 at 21:26 Zac67 25.2k

Top Questions

Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.