GLBP and dual NIC server

Hi, I'm testing GLBP across a VLAN on a pair of layer 3 6500 server farm collapsed access/distribution switches. ie the VLAN is routed locally and via dual L3 uplinks to the core. The server is a dual NIC compaq server in active/active mode. Seems to work fine, can anyone see any potential issues? rgds

GLBP is a stable feature and you should not have any problems inplementing it. As long as the configuration is correct and the design has been properly understood the GLBP implementation will work fine.

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Catalyst 3750 12.2(25)SD1 and dual nics

When a Catalyst 3750 stack master fails or leaves the stack, a cross-stack EtherChannel in trunk mode running Link Aggregation Control Protocol (LACP) protocol might stop forwarding traffic on some VLANs.
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Network Infrastructure: LAN Routing and Switching
I have upgrade a Catalyst 37024 TS 2 switch stack to 12.2(25)SED1 from 12.1(14)EA. The switch has an Alpha Server Custer connected to it the cluster has two servers each having two nics . There is a active server which has an application IP address and each server has a Server IP address one nic active ata time.
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I forgot to add if I shut both interfaces an then do a no shout on both the issue is resolved until the next night.

DHCP and dual nic

Kia ora Y'all,
Advice please, is it appropriate and necessary to assign a static ip address to the server which runs the dhcp service, for example if I have manually assigned my server 192.168.1.1, do I also have to give it a static ip address of 192.168.1.1 in the DHCP static maps settings.
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regards
regards

I have manually assigned my server 192.168.1.1, do I also have to give it a static ip address of 192.168.1.1 in the DHCP static maps settings
No. Not at all.
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Is the mac mini server the same hardware as the other mac minis (except for the quad core i7 and dual hard drives) with different software or is it configured differently?

I have a mac mini with an i7 dual core processor. It is perceptably slower than my macbook pro with a quad core i7. Does the mac mini server have the same hardware configuation as the regular mac mini with server software or is the hardware different (aside from the i7 quad core and dual hard drives)? I want a mini with a quad core i7...

Your assumption is correct. The server does however only
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Do someone know how can I setup dual boot of Windows Server 2008 R2 and RHEL 7 Server?
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Hi Oleg Vazhnev,
Please refer to following article and check if can help you.
How
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Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft
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Meanwhile, please also refer to following video and check if can provide you more details of installation.
Install RHEL 7 in Legacy Mode (Dual Boot Windows Server
2008 R2)
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft
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If any update, please feel free to let me know.
Hope this helps.
Best regards,
Justin Gu

Dual nic NAS and Jumbo Frame

I am posting this on the server area because I doubt I am going to get an answer anywhere else.
I have a linux based NAS running netatalk and avahi (afp server and bonjour) with two nics and I have a brand new Mac Pro with two NICS. What I want to do is run a crossover cable between the NAS and the Mac Pro in addition to both being plugged into the normal network. The normal network would have 1500 byte mtu so my internet performance and all of the various vintages of print servers work ok. The dedicated network would have jumbo frames. As we get more Mac Pros, we would add a switch and more machines to this secondary jumbo frame network.
That in theory should work fine (I have done it with other operating systems). My quandary is how to get the Mac to always connect to the NAS via the Jumbo nic and not through the other nic? The Mac learns of the server via Bonjour, so how do I tell it to prefer the "appearance" of the server on the jumbo NIC vs the appearance on the normal network. I know with WINS or DNS I can override the name resolution with a LMHOSTS or hosts file entry, can I do the same with Bonjour?
Thanks for any help or any pointers in the right direction!

I think you are misguided in your assumption that I am not intimately familiar with TCP and don't know what I am talking about.
TCP does not "negotiate" MSS, it advertises the MSS of each side to the remote in the 3 way handshake. It is perfectly acceptable to have asymetric MSS values. TCP does NOT NEGOTIATE a common MSS size. On a LAN, this will result in a functional communication. UDP however does not have such mechanisms and will fail.
TCP will also not function properly in the scnario of my local workstaion with jumbos enabled communicating with a distant endpoint that also has jumbos enabled across a transit network that does not support the maximum MSS used by one of the end stations. For giggles let's say the far end is FDDI and has 4k frame size. Our transit does not support frame sizes larger than the "natural" frame size of 576 bytes. We will use a 4k frame size from me to the remote and a 9k from the remote to me. If the remote sends to me it can use the full 4k MSS of token ring because its less than my MSS. In the reverse my workstation would send 4k frames back to the token ring station. Successful communication would then depend on path MTU and intermediary routers to send ICMP type 3 code 4 messages to signal back to our end stations to reduce our MSS (assuming the DF bit is set on our traffic or the transit router is incapable of fragmentation).
This is perhaps a bit of a flippant example in that nobody would be running FDDI or Token ring anymore, but random entities on the internet will run jumbo frame and perhaps some other l2 technology we aren't familiar with.
Did you ever deal with someone on a token ring segment trying to hit 3Com's web site when it was fddi or token ring? I have on several occasions. I also see this with VPNs all the time. Cisco's genius recomendation is to reduce your MSS on your server as some of their products don't support PMTU. I have had a Cisco <-> Juniper VPN where transfers worked one way because the Juniper would silently strip the DF bit from the packet and fragment it and the Cisco router (38xx) wouldn't do the same in the reverse direction. I also went through **** with the Nortel Contivity VPN devices while they sorted out what to do with the whole MTU negotiation issue.
I have spent many hours of my life pouring through sniffer captures because of mismatched MTUs. Let's not forget the old days of FDDI backbones with ethernet segments bridged across them and FDDI attached servers... mismatched buffers... no thanks.
I therefore don't want to waste my time troubleshooting some bizzare networking issue when there is a perfectly valid way of solving the issue for absolutely minimal expense. I am moving large files here (certainly large enough to get well out of TCP slow start), we easily saturate the full gig link minutes at a time and a saturated gigabit link at standard frame size is inefficient due to the interpacket gap which is locked at 96 bit times for ethernet and the 40 bytes of TCP/IP header plus whatever application payload is prepended per packet on each link. Cutting the number of TCP/IP headers and (probably more importantly since most decent nics do checksum offload these days) application layer headers also reduces load on both client and server.
On large sequential bulk data transfers jumbo frame effectively increases performance and reduces overhead. Period. I have implemented it from the early days of Alteon hardware in Sun servers through Juniper EX products last week. Every iSCSI implementation I run into is jumbo frame based for those exact reasons.
That being said, I don't need to restrict anything. All I want to do is to override bonjour/mDNS for this particular host such that the Pro always communicates over the jumbo segment. This is easily accomplished in windows with an LMHOST entry or in a unix environment with a HOSTS file entry. Is there some way to override bonjour from the client side? I'm ok even statically defining the services presented by bonjour on this host.
I am also willing to force all bonjour requests through a DNS server, however Apple doesn't have any decent documentation on how this is accomplished in an enterprise environment.

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ORA-01041 internal error. HOSTDEF extension does not exist
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VCSE with dual NIC / SIP H323 encrypted call / traversal and non-traversal call license questions

Dear All,
I have a few questions and I would appereciate if someone will answer my questions?
1) May I know pros and cons of using Dual NIC and single NIC with VCSE in DMZ?
2) In order to make H323 and SIP encrypted call, what configuration need to be done on Cisco endpoint, non-cisco endpoint, VCSC and VCSE (both signalling and Media need to be encrypted).
3)let say my VCSE is in DMZ- endpoint A (cisco) and endpoint B (non-cisco) are registered on VCSE. I would like VCSE to use non-traversal call license when A call to B or B call to A regardless of whether H323 or SIP call.How can I force VCSE and endpoints to use non-traversal call. I only want VCSE to handle signalling and media is EP to EP direct. As traversal license is quite expensive.
I found following information from Cisco document.
all Cisco TelePresence endpoints are traversal enabled and so a traversal license will always be needed when at least one of the endpoints involved in the call is a Cisco TelePresence endpoint.
Is it possible to disable traversal client feature of Cisco endpoint?
Thanks and Best Regards,

voice register pool 4
add-->codec g711ulaw
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no create pro
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Dual NIC on ACS CSACS-1121-K9 Server for ACS V5.2

Is it possible to have Dual NIC on ACS v5.2 such as teaming or any else??
I am thinking of connecting the two NIC on the CSACS-1121-K9 appliance to two swtiches on the same network, but wondering if it will be possilble or not.
Can anyone help me regading this?? Please help me!!

No you can only use one nic on the ACS appliance.
http://www.cisco.com/en/US/docs/net_mgmt/cisco_secure_access_control_system/5.2/release/notes/acs_52_rn.html#wp190802
The extra ethernet port comes blocked.
Thanks,
Tarik

Redundancy with dual nic servers

Hi I have 2 11500's configured with box-to-box redundancy. I have a number of app servers each with dual nic's (which are Teamed) and which are connected directly to the CSS's. Nic 1 in each goes to the master CSS1 and is therefore live. Nic2 goes to standby CSS2.The CSS's are connected two 4500 switches to the public.I am monitoring the links to the 4500's,if i switch off the master CCS1,we fail over and the servers all connect via nic2 to the new master CCS2. But when the link to the 4500 from the CSS1 Master goes down the CSS'S failover but the nic2's do not connect to the CCS2 because Nic 1 in each server has not failed ie they still see CSS1 as up. Is there a workaround to this problem ?
Thanks
J

I know of no way to link CSS interfaces so that if the uplink goes down, the the other ports are shutdown. There may be another way to configure the adapter teaming or failover on the server side. I know some OS's send out test frames from one adapter to the other to verify network integrity.
What I'd recommend is that you setup a VLAN on your 4500's for the server's physical connections, and uplink that to a "backend" interface on the CSS. This can be done with the CSS in either a router or bridge configuration, but I'd recommend router mode.

Setting Up Dual NIC Cards? Benefit?

Hello Everyone,
I know that the Mac Pro line comes with Dual NICs and I was wondering how do I set these up to be useful with my Cable Modem and Router? Can they be used to get more speed or are they used together in some other capacity.
I really appreciate anyones help and expertise.
Many Thanks,
Chris

The normal use of dual nic interfaces would be to run double instances of a given server on disparate IP numbers. Dual NIC's are generally employed in order to attach multiple IP addresses to a single machine.
Another potential use for dual NIC's is internet connection sharing, where your Mac Pro acts as a kind of router; again also this could be used for attaching one NIC to print services and the other NIC for LAN/WAN access.
OK, actually there are a whole bunch of good reasons for dual NIC cards, but 'doubling your bandwidth' is really not one of them. Believe me, unless you are on a direct fiber OC-10 20 foot from your ISP's NOC, then your existing single NIC has 1000 times the bandwidth of your incoming WAN connection.
It is likely possible to interleave dual NIC cards between two machines for bandwith purposes; but if that were going to be the canse, just identify one as "in" and the other as "out" (both machines would have to have dual NIC's to make this mean anything) but again, I honestly do not see a real world use for this...
Message was edited by: psalmsmith

Two ISP connection and 4 NIC

I have two ISP connections for Internet and the BM server has four
interfaces, two public interfaces with completely different IP addresses
and two private interfaces.
I want to connect two different Terminal Server one for each ISP
connection.
When I connect to the public side of the server, I can only connect
to the public IP address that is in the same subnet as the default route
uses.
Thank you

In article <HwTIi.1699$[email protected]>, Valentin wrote:
> When I connect to the public side of the server, I can only connect
> to the public IP address that is in the same subnet as the default route
> uses.
>
That is correct.
This one gets tricky, because of routing issues. If you know NAT, you
might be able to enable dynamic NAT on the private (LAN side) of one of the
internet routers. That will make all traffic coming in that way look like
it comes from a local address, and the second NIC will respond to it.
Otherwise, all traffic will end up going to the default route. You may
need filter exceptions to allow such traffic to go between public NIC's, if
it works at all.
If you just want to RCONJ to the second public NIC, you might be able to
configure static NAT of that address to itself, but the default route and
filters are still going to give you grief.
You might want to look at tip #51 at the URL below, for a system with 2
subnets on one public NIC.
It sounds to me like you need a dual-WAN router to handle the two ISP
connections. I've set up a number of servers that way using inexpensive
Xincom routers (www.xincom.com).
Craig Johnson
Novell Support Connection SysOp
*** For a current patch list, tips, handy files and books on
BorderManager, go to http://www.craigjconsulting.com ***

Proliant DL380 G5 - Dual nic drops gateway after windows update.

On yesterday Microsoft windows update updated my DL 380 G5 sever. Part of the update was a nic driver. Needless to say the server didn’t like the update. After the update, the dual nic card will not keep the gateway. I've rolled back the driver but still no luck. Any ideas on how to fix this? My first thought was roll back the driver. Second thought download the drivers from the manufacture but I cannot determine which nic it is. How can I go about finding the exact nic type and name?

Hi:
You may also want to post your question in the HP Business Support Forum -- DL Servers section:
http://h30499.www3.hp.com/t5/ProLiant-Servers-ML-DL-SL/bd-p/itrc-264#.Ujohb18o7Gg

Hackers and USB NIC

I've taken on a new client and have inherited a mess. Far beyond what I'm about to describe.
This is a network of over 20 Macs and a Mac mini with OS X server.
Upon my first visit at this location I discovered the Mac mini server's built-in NIC had failed, and to corect this the prior IT person had set up an Apple USB 100-BT NIC for the LAN. He had also set up another Apple USB 100-BT NIC with a direct-connect to the internet via a public IP, bypassing the Cisco firewall.
Don't ask why. ;-)
This second NIC with the direct connect has burned out 4 times so far. I firewalled it yesterday.
However, by reading through Console logs I did discover that hackers were trying to intrude via that NIC. The logs were flooded with thousand upon thousands of entries for this hacker activity - every single day.
Does anyone think this hacker activity was responsible for the burned out NICs? Each time the USB NIC would burn out there would be massive amounts entries in the Console logs for the hacker activity.
If someone were to have asked me if it were possible to burn out a USB NIC like this I'd say unlikely. But it sure does explain this nicely.

There are a variety of folks that are always trying to access Internet-connected systems and for various purposes, and that's part of the Internet environment, and it's why I usually recommend a server-grade firewall for configurations running OS X Server and server-oriented computing. Having a directly-Internet-connected server is more effort and more risk than its worth, in my experience.
Electrical grid control to the level of an Ethernet uplink is not typically available to the nefariously-inclined.
All that written, I'd expect there's a wiring problem with the upstream Ethernet connection, and the NIC is receiving excess voltage, or possibly a grounding or voltage problem with the system and its power source or other system external wiring components that's being grounded via the NIC connection. This can include nearby lightning, general grounding and wiring faults and floating grounds, interference or electric surges from unusual or large-amperage local devices, and related issues. Too much power arriving via the NIC that burns it out, or too much power departing via the NIC that burns it out. These repeated faults are usually environmental, and not usually triggered by the nefariously-inclined.
You can check with an electrician, and particularly one with some low-voltage experience. The electrician may suggest monitoring the voltages at the system and at the network and there are tools available to do that, or might suggest surge suppressors or capable less-interruptible power supplies (LIPS, they're never truly uninterruptible), or some combination.
In my experience, simply replacing burned-out components isn't a viable long-term fix for power surges and over-voltages and grounding issues.
It's also possible that there's somebody locally that's accidentally or intentionally introducing voltages or surges where they shouldn't. Phone line connections don't mix all that well with Ethernet connections, for instance.

Dual-homed server to two Cat4948 switches

Hello everyone,
I have a picture above which I want to realize. The main point is a dual-homed server connected to two switches.
At server OS needed to configure NIC teaming which uses LACP. But how I can do it at Catalyst 4948?
Which technology I able to use to multi-switch etherchannel?
If I need one more link between Cat4948, then I can do.

The exact load sharing options available to you will probably depend on the server type / vendor. The settings are applicable to the Network Adapters but you usually use the configuration utility provided by the respective vendor. I would suggest you do a quick google search on your particular server model. An example is:
http://www.brianmadden.com/blogs/guestbloggers/archive/2006/04/19/hp-proliant-network-adapter-teaming-explained.aspx
Atif

GLBP and dual NIC server

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