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Wired Networks Thread, Losing Internet Access on 2008R2 Servers in Technical; I've got 2 Dell R710 servers with a PS6010 San all connected up and working fine using Hyper-V with an ...
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    Losing Internet Access on 2008R2 Servers

    I've got 2 Dell R710 servers with a PS6010 San all connected up and working fine using Hyper-V with an iSCSI switch.

    However I am having some really strange issues getting them to connect out to the internet. They can both browse network shares on the rest of the network and can be seen from the rest of the network, but I can not get them to connect to the Internet. They are both joined to the domain and therefor have the correct Proxy details. I have updated the network drivers for both network cards and I'm completely stuck for ideas.

    Does anyone know what might be causing this and how to fix it?

    Thanks in advance.
    Rich

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    Checked the default gateway is correct? / if so, can you ping it?

    Can you ping the proxy?

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    I had this exact same problem with some hp proliant servers when I was configuring our hyper-v cluster. Ping the gateway and see if it works, if you have teamed network adapters on the lan side, try disabling all but 1 of the team members and see if it will access the gateway and internet again right away.

    I fixed it in the end with updated firmware and drivers.

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    Quote Originally Posted by kmount View Post
    Checked the default gateway is correct? / if so, can you ping it?

    Can you ping the proxy?
    The gateway is correct, but our gateways don't respond to ping requests.

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    Quote Originally Posted by ChrisMiles View Post
    I had this exact same problem with some hp proliant servers when I was configuring our hyper-v cluster. Ping the gateway and see if it works, if you have teamed network adapters on the lan side, try disabling all but 1 of the team members and see if it will access the gateway and internet again right away.

    I fixed it in the end with updated firmware and drivers.
    I've updated the network drivers now but that doesn't seem to make a difference. Which other drivers would you look at updating?

    I don't have any teamed LANs setup as yet.

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    I had to do LAN drivers and the HP Teaming software, dunno if DELL has anything similar.

    You mentioned you have your san connected with iscsi. Is that done with teaming, multi-path io or with a single connection at the moment?
    Is the iscsi switch isolated from the client network and do the iscsi adapters have addresses on a different subnet?

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    Quote Originally Posted by ChrisMiles View Post
    I had to do LAN drivers and the HP Teaming software, dunno if DELL has anything similar.

    You mentioned you have your san connected with iscsi. Is that done with teaming, multi-path io or with a single connection at the moment?
    Is the iscsi switch isolated from the client network and do the iscsi adapters have addresses on a different subnet?
    It was setup by Dell so I'm a bit vague on how it is connected exactly. From what I recall it is on the same network but uses VLAN to separate the traffic. Each server has 2 connections to the SAN.

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    It may be that the server is trying to access the internet through the iSCSI vlan instead of the correct one, however, if that was the case I'm not sure youd be able to talk to the other servers, hmm.

    Does DNS resolution work? ie nslookup www.google.com

    Also, you said you cannot ping the gateway, is the proxy server internal or external and can you ping that?

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    DNS resolution works.
    I have disabled IPV6 and that seemed to kick it in to life, as in I could get out on to the internet but then seemingly at random it will stop connecting to webpages. Is there anyway of forcing the machine to use a specific nic or are there some other proxy setting I need to set that I have over looked?

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    One thing to do is make sure that the iSCSI nics dont have a gateway configured, then it will have no choice but to use the right one.

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    Quote Originally Posted by ChrisMiles View Post
    One thing to do is make sure that the iSCSI nics dont have a gateway configured, then it will have no choice but to use the right one.
    Good idea. Check that, neither of them do. It's just got a static IP address and a subnet mask.

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    So disabling ip6 causes it work sporadically, hmm, try running a continuous ping on the gateway while you browse the net (ping /t)and see if the ping drops out as well as the websites.

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    AHHH this is crazy!!!
    It is now saying on network connections that I have Internet access but, I can't get to any websites or ping anything on the internet.

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    lol its giving you the run around. I think the internet access check contacts something at microsoft, does microsoft.com work? Is it possible to test it on an internet connection without a proxy in the way?

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