Network Issues (cisco / Nic Duplex)
Apr 29, 2008
We are currently showing a bunch of our server as half duplex on the nic when performing the command "ethtool eth0". The switches are all set to full duplex on our network.
Every single port has duplex full and speed 100. We can't seem to figure out why specific servers are showing half duplex and some are showing full. Can anybody give any insight on this issue and perhaps where to look? I am stumped at this point.
here is an example of one showing half:
ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Half
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: umbg
Wake-on: g
Current message level: 0x00000007 (7)
Link detected: yes
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Jun 26, 2007
I have just bought a switch Cisco 3750. However, when I plugged in the uplink. The link is set to half-duplex only (auto-negoiation).
Below is the error in the "Diagnostic Log" of the log:
03:54:52: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet1/0/18 (not full duplex), with sw6.hkg3.asianetcom.net GigabitEthernet0/21 (full duplex).
I have tried to set the port to "Full" in Cisco. But, the link drops immediately. Could anyone tell me how to fix that?
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Dec 16, 2007
My host has helped me to install a switch. However, I don't know how to configure using the command line. Could anyone help me?
I need to be able to connect to my Cisco switch using Cisco Network Assistant. If you know the command sequence,
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Feb 3, 2007
I got problem with collisions
I think this because of half duplex that nic does:
eth0: no autonegotiation, 100baseTx-HD, link ok
product info: vendor 00:00:20, model 32 rev 1
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD
link partner: 100baseTx-HD
Is this because of nic or switch?
what is link partner?
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Jun 17, 2007
I wonder what does this mean. I no what a 100mbit connectivity is but what does it mean by burstable.
Does it mean that the downloading will start off really fast and then go down to my normal internet connection. What i mean is that if i download say from the microsoft.com, It will start at about 400kb/sec and then slowely progress to 260kb/sec.
With my server with in a datacenter, it starts from about 100kb/sec and then makes it way up to 260kb/sec. I am moving datacenter. So what does it mean by burstable.
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Oct 14, 2009
any experiences to report about purchasing used / refurb gear from either Network Liquidators (nweq.com) or Network Hardware (networkhardware.com)?
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Jan 6, 2008
Anyone know anything about cisco pix 501s? i need help setting one up if anyone can give me a hand.
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Jan 13, 2008
I just got a Cisco PIX 501 from my IT Guy for home use and he didn't reset the firewall to default settings so there are ton of old commands in here.
Is there a command I can use to reset the firewall back to the factory default settings?
Or is there anyway I can flash it back to factory default settings?
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Apr 19, 2008
I am interested to buy a Cisco ASA firewall. So far I have never played with this gears and I wonder if it is easy to setup.
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Aug 21, 2007
We are looking to replace our existing WatchGuard Firebox's with a hopefully more reliable firewall from Cisco's range although I'm a bit lost when it comes to the different ranges.
Could somebody suggest a firewall that is capable of:
1: Both NAT & Drop-in (bridge) mode
2: Pretty low bandwidth requirements, no more than 10mbit/s traffic
3: SNMP Monitoring
4: High availability pairing
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Mar 25, 2009
I am on a tight budget for a Cisco firewall. I am browsing and seeing some affordable options in the x600 series.
Please tell me, which series is best?:
1600
2600
3600
The higher the better?..
Also what about submodels, like is 1650 better than 1600?
And how can I tell how much DRAM each one can take up to?
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Apr 22, 2009
I see a lot of DDos related articles here at WHT. We've got hit multiple times by DDos and had to handle those attacks everytime with a different approach.
The largest one and the most well know one (we were in Times Mag, AP news, CNN, slashdot, you name it - just do a search about us on WHT) was Russian botnet cyberattack - we had to anaylyze netflow and then block everything on our edge routers, then on the firewall and then locally on the servers.
Since then we had number of other attacks, some of them we were not able to defend on the server level, while, as you can understand we can't do netwflow and manual intervention evey time somebody gets an attach.
We have very good scripts which allow to mitigate huge number of DDos attack, whet our scripts are finding attacking IPs and blocking them automatically - still some attacks could be blocked only on the router level.
I've read that Cisco Guard (I am interesed in 65xx version of it) suppose to mitigate DDos attacks in automatic mode.
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Sep 25, 2009
after months of disruption moving servers into a new data centre, our once reliable colocation company has now had nearly 6 hours downtime in the last 16 hours. So much for network redundancy.
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Sep 23, 2009
I am looking at picking up a switch to mess around with at home. I found the following within driving distance but have no idea of which one will give me more up to date, hands on experience. Any feedback is greatly appreciated.
Used Cisco WS-C5509 Chassis with power supply ( POWER SUPPLY 34-0870-01), and fan (WSC5509FAN)
Cisco WS-X5530-E2 Supervisor Engine III Modules
Cisco Systems WS-U5537-FETX CISCO 4 PORT 100BASETX UPLINK MODULE
Cisco WS-X5234-RJ45 Switch Modules X 8
$160 each.
Cisco WS-C5500 Chassis
POWER SUPPLY 34-0773-03
Cisco Ws-x5550 Supervisor Engine Iii G-series
WS-X5234-RJ45 X 11
For $200
Cisco WS-C5505 Chassis
Cisco WS-X5530-E2 Supervisor Engine III Modules
Cisco WS-U5533-FEFX-MMF Supervisor Engine III Uplink Modules
Cisco WS-X5225R Switch Modules X 2
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May 12, 2008
I'm trying to learn about network. I bought Cisco 2950 for testing. I set it up and finding out the way to cap its ports at 20Mbps or 50Mbps. Do you know what command or how to do this?
Also what command to check the port speed or to uncap the port?
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Jun 5, 2007
Other than eBay does anyone know of a supplier of Cisco gear that has good prices and knows their Cisco equipment?
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Jul 27, 2007
I am setting up a small ccna lab and i have RIP working and i can ping my lan from both routers, but only certain hosts on the lan from the one router the setup is
LAN (192.168.1.0/255.255.255.0)
|
/
router 1 E0 192.168.1.45
Serial0 10.10.10.1
|
/
Serial0 10.10.10.2 (of router2)
|
/
E0 192.168.3.250
E1 192.168.2.250
Lo 192.168.5.4
I can ping 192.168.1.102 from router 2 and 192.168.1.45 but no not 192.168.1.201 ... or 192.168.1.1
also i can ping 192.168.5.4 from 192.168.1.102 which is a linux box and an ip route to tell it that 192.168.5.0 can be gotten from 192.168.1.45
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Jul 12, 2007
What is the difference between the Cisco PIX and Cisco ASA Firewall Systems?
Also which firewall do you guys recommend for a rack of servers
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Jul 11, 2007
I am currently looking at these Cisco switches:
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- Cisco 2950 WS-C2950-24 Catalyst Switch
- Cisco 3512 WS-C3512-XL-EN Enterprise Switch
- Cisco 3524 WS-C3524-XL-EN Enterprise Switch
- Cisco 3548 WS-C3548-XL-EN Enterprise Switch
1) I was recommended to chose the XL-EN model switches because it seems they have more Memory, but the second one in the list (Catalyst) is not a XL-EN, is that going to have any affect performance wise? or it doesn't really matter?
2) I was also recommended to choose managed switches because that way I can use the SNMP features to measure bandwidth, are any of the switches above unmanaged?
3) I also want to be able to manage the switch remotely, web managed, are any of the switches above web-manageable?
4) Most importantly, when my datacenter give me a 100mbit drop, I dont know which port to plug it in in the 29** series. In the 35** I see it clearly but I am not able to see it in the 29**, any ideas?
5) On some of these switches I see a special port called "Console", what is it? where does that connect to?
6) Do any of the switches above not have a console port?
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Sep 28, 2007
My network currently looks like this :
ISP ->> L3 Switch ->> Firewall (Transparent Mode) ->> Switch ->> Servers
I have a single /24 and my firewall is on x.2 and routes traffic for each of the servers.
Now i have a new Cisco ASA 5510 that i want to replace the aging firewall currently in place, however i dont want to put the firewall into transparent mode because i dont want to lose all the functionality.
Now with most firewalls your outside subnet cannot be the same as your inside subnet, which is fine if you are using NAT but i dont want to NAT. I need all of my servers to remain with their public ip addresses.
So what is the ideal way to setup something like this? Request my ISP give me a /30 for the ASA outside interface or something? And then ask them to route my /24 through the /30 new subnet?
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Sep 18, 2007
whether I can grant a specific vlan priority over all other traffic..and if so does anyone know an appropriate site where I can find documentation on how to do so?
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Jun 19, 2007
Is there such a switch?
Do cisco do a 24 port 1000Mbs switch that you can control each port speed through a web based software?
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Apr 27, 2007
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May 16, 2007
From the posts in this forum it would appear that a number of forumites are colocation service providers and web hosters that use Cisco gear.
I was reviewing the Cisco End User License Agreement that was included in the router box. Under the General Limitations section, "Customer shall have no right, and Customer specifically agrees not to:", item (iv) states, "use or permit the Software to be used to perform services for third parties, whether on a service bureau basis or time sharing basis or otherwise, without the express written authorization of Cisco".
Does this mean that a service provider is required to acquire
a separate license similar to the Microsoft Service provider license?
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Mar 1, 2007
I have a cisco 2960G switch that I used for colocation, the colocation provider does all the routing all I need is this switch. It's just a plug and play operation, however I now need to do some more difficult stuff.
So, I plugged their bandwidth uplink into port 20.
I have really no idea on how to setup anything other than the basic of the switch.
Is it possible to setup Private Vlans in this situation? I am in need of a setup like this:
All port 1-19 in private vlans, but still able to communicate with port 20 to get internet access. Port 1-19 cannot communicate with each other except by going through port 20, through the internet.
I also want to know if it's possible to statically assign each port with a specific IP? Just say I want all traffic to a static ip to only go to port 1? Is that possible? I want to be able to limit the control of IPs through the switch not through the server.
Right now all my IPs are assign on the server level, meaning the server can take each other IPs and mess with each other connections.
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Oct 1, 2007
at 11x 2851's. When we got the quote they had added on Cisco Advanced IP SERVICES.
We arent sure if that is just the security bundle, or something they are trying to toss on for more money.
2851 w/ AC PWR,2GE,4HWIC,3PVDM,1NME-XD,2AIM,IP BASE,64F/256D
Cisco 2800 ADVANCED IP SERVICES
Maximum Compact and USB Flash
Four port 10/100 Ethernet switch interface card
Updated 1-Port T1/Fractional T1 DSU/CSU WAN Interface Card
64 to 256 MB CF Factory Upgrade for Cisco 2800 Series
256MB USB Flash Token for Cisco 1800/2800/3800 series
Cisco 2821/51 AC power supply
Power Cord,110V
Device manager for routers
256MB DDR DRAM Memory factory default for the Cisco 2800
8X5XNBD Hardware Replacement 2851 w/ AC PWR,2GE,4HWIC,3 (1 Year)
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Aug 3, 2007
My understanding is that the IOS software running in most of their products is non-transferable. So clearly this prevents a user from receiving updates if they purchase used hardware (i.e. ebay). However, isn't it possible to purchase an IOS software license from Cisco for any of their supported product?
Their web site is a mess! I've spent, literally, hours on their site trying to figure out how to purchase such a license, or how to purchase a service plan that might entitle me to IOS updates.
And how does "SMARTnet" fit into this puzzle? Do I need a SMARTnet contract to download maintenance updates, even for *new* hardware that I've purchased?
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Oct 16, 2009
i want a Cisco firewall suitable for one dedicated server protection, that server would host up to 30 vps
and i may buy another server in future, so what do you recommend?
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Oct 16, 2009
from where can i get the price of cisco firewall?
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Sep 21, 2009
On used equipment (for example, 6509s), is there any possibility of getting IOS upgrades from Cisco? Is there any sort of re-certification process? My only concern with used equipment is that often times the firmware is years old.
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Nov 3, 2009
I already get a new firewall for my server cisco ASA and I don't know how to config it
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