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1500 questions
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votes
3 answers

Can ARP tables store addresses for other networks?

This is perhaps a weird question, but I'm in a weird situation where I want to route traffic from network A 192.168.1.0/24 to network B 192.168.2.0/24 via 192.168.1.5 (the address of B-router in the A network). The A-router doesn't have a…
TrisT
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6
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1 answer

The purpose of last database description packet sent by the slave router during adjacency process

I've been learning OSPF adjacency process using packet tracer. The topology is a simple point-to-point network - two routers are connected with ethernet cable(fastEthernet 0/0 on both ends). Here are the logs of the slave router: Send DBD to 2.2.2.2…
MyrzabekK
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6
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4 answers

60 devices on a /29 network

My company asked me to set up a network with 60 devices (all have MAC addresses and use IPs, but they are not all computers), there is a 3rd party company that will maintain the network. They are also responsible for their internet access. I…
GTomaras
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6
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2 answers

Is there any reason to use unique local IPv6 addreses in a production network?

The title pretty much explains everyrthing. Since there is a huge amount of IPv6 addresess, couldn't every device just use a global unicast address? What is the practical use of unique local IPv6 addresses? Thank you all in advance.
Mitrixsen
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6
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2 answers

SNMPv3 Setup - Cisco 3750

I am not a network guru by any means but need to setup our router/switch to use SNMPv3. I am installing What's Up Gold on our system and configured the settings (changed for this post) as follows: Username: testusername Authentication Protocol:…
JMeterX
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6
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1 answer

1000 Base-LX compatible with 100 Base-FX

I'm trying to connect a Cisco Catalyst 3750 12-port SFP switch to a RuggedCom RSG2100 with fiber ports. The Cisco has a third-party SFP (GLC-LH-SM) that shows in "show interface" as 1000Base-LX, and the CLI gives me no options to set the speed and…
armani
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6
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1 answer

Cisco ASA 9.0(1) - NAT / PAT

I'm trying to open some ports in my ASA 5505 Firewall with the 9.0(1) software. I've being using another ASA with a lower software version. As you can imagine I'm quite confused and have been reading all CLI guides from Cisco and looking at…
Mötz
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6
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1 answer

How to repair a break in a long Cat-5e cable run

I have a long run of Cat5e which is broken at about 20' from one end. Replacing the entire cable isn't an option, as it's fairly long and is going through walls and such. Searching this on google produced nothing but silly results, one of which…
nageeb
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6
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2 answers

Cisco PBR with DMVPN and Dual ISP

I have a DMVPN hub with 2 ISPs. I have two tunnels setup between the spokes, one for each ISP. I would like to dedicate one of the ISP links to voice traffic and failover. I'm having trouble achieving both. In my current config, voice travels where…
Jeremy
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6
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1 answer

Why do we need deny statements in extended access list if there is an implicit deny all at the end?

Can somebody give me an example, where deny statements are needed? Why can't we just permit all the traffic according to specifications and then let the implicit deny all capture the rest?
Rubus
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6
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3 answers

WiFi versus Wireless LANs

I've just started learning about Wireless networks and I have a question about the terms "WiFi" and "Wireless LAN". Whenever I think of WiFi, I think of connecting wirelessly to the network and to the internet, which is basically what a WLAN is,…
Mitrixsen
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6
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2 answers

What are the best Cisco 6500 Ethernet modules for iSCSI?

I have a SAN environment built on FC (Fibre Channel), which is a standalone network from the rest of the DC Ethernet network, and have only Cisco 6509s with Sup720s available for this project. Most SAN traffic would be from VMWare with web server…
generalnetworkerror
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6
votes
2 answers

Cisco IP Phone 7941 Never Asks for TFTP files?

I've been reading and googling for the past week trying to wrap my head around the Cisco IP Phone TFTP upgrade process. The effort has been to try and make a Cisco 7941G work with Asterisk. This process has been documentended well in many places and…
Jim
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6
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2 answers

Why we need IP address on LAN if switches can't read IP addresses

A beginner question: Why we need to assign IP addresses on LAN if switches are not able to read them? Because of ARP (Address Resolution Protocol)? But Switches can't send ARP requests (switches can't read ipv ), right? Who sends the ARP request…
kzs
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6
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0 answers

DHCPv6 Relay Agent on Juniper — Packets dropped: No SAFD

I tried to setup a DHCPv6 relay agent on a Juniper EX3400 switch. (SLAAC is unfortunately not enough for this use case.) While the setup of the (non-v6) DHCP relay agent worked flawlessly and was well-documented [1][2], the DHCPv6-part of manual [3]…
miho
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