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1500 questions
6
votes
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
votes
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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6
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1 answer

Wireshark tcp.len and data.len missmatch

What is the difference between tcp.len and data.len filters? I thought that both mean data size traveling in the segment (not including TCP header). I have a problem related to MTU issue and I'm trying to figure if data size from application layer…
MABC
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6
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5 answers

Dividing a network into subnets using a router

I am learning about how L3 and IPv4 addressing works and I need some clarity on certain things. I've encountered the following topology So in this topology, the router stands in the center and divides the network into two separate sub-networks,…
Mitrixsen
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6
votes
1 answer

Successful Auto/Auto PAgP Port Channel?

Cisco documentation states the following on forming channels: SW1 SW2 ---------------------------------------- On On = Yes Auto/Desirable Desirable = Yes On/auto/desirable Not configured =…
John Doe
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6
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1 answer

Can a pair of matching WDM transceivers be connected directly?

In fiber optic networks, I understand CWDM technology can multiplex multiple optical signals onto a pair of fibers (or a single one). But can a single pair of CWDM transceivers be connected directly using a pair of fibers without the use of a…
Duvrai
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6
votes
1 answer

Cisco 9300 Software upgrade without automatic reload

Is there a way to upgrade a Cisco Catalyst 9300 switch to a new software version without the switch automatically reloading as part of the initial install process? With other switches (eg Cisco Catalyst 3850) I could do the software install and then…
The Footsie
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