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Jan
3
comment SMB Server & Switch
To add some perspective for you. Imagine you segregate the switching perfectly and you only share an internet connection. One virus infection can get your IP address blacklisted across many email providers. When your tenant suddenly can't send email because of one of your computers is infected, what is your plan? Because your tenant will start using words like 'lost business' and 'damages'.
Jan
2
comment SMB Server & Switch
Ideally, you only share the room. No equipment cross over at all. The point of a wiring room is to have all your wires meet at one point in order to maximize flexibility with cross connections. Sharing equipment/networks/telecom is something that should be avoided. This goes double when you don't have expertise in this area.
Nov
25
comment Routing between many systems, no first hop
Smells like a masking issue. Can you add your route tables? At least for the main router?
Nov
12
comment Access server using IP on another interface
OK I think I understand your question better now. It's just that you can't reach the public IP successfully from the LAN. What happens when you try to tracert to the public IP from the LAN?
Nov
12
comment Why is Windows 7 not following all routes?
You've got an issue at layer 2. Your computer can't ARP for machines on the same broadcast domain. That's why adding a static route works. When you add the static route, you ARP the gateway successfully and the gateway can ARP the destination for you. To work correctly the ARP should be peer to peer. The router interface your computer is connected to is probably providing a layer 3 boundary (routed) rather than just a layer 2 segment (switched).
Nov
12
comment Access server using IP on another interface
What are your DNS settings? If you want this change across all services, make the public IP resolve for the my-domain.com server.
Nov
9
comment Disk performance below expectations
The drives would have to be removed from the array to test. The default array settings might not be optimal for your use. The stripe size and caching which can impact I/O performance dramatically.
Apr
8
comment Ghost “vlan 0” tags added to ethernet frames in CentOS guest under OpenStack
Do you have an ifcfg-eth0.0 file in /etc/sysconfig/network-scripts/?
Apr
8
comment Ghost “vlan 0” tags added to ethernet frames in CentOS guest under OpenStack
The switch could be adding the tags. What does your VLAN topology look like?
Apr
8
comment Can't reproduce arp non-response issue with spoofed packets
Lorin, very interesting issue. The requests appear identical. I'm curious what the conversation looks on the other endpoint. What ARP traffic does 10.40.0.5 see?
Apr
3
comment Issues with connecting to network resources after segmenting network
Firewalls don't tend to cause chronic issues, but lets not rule anything out. Take a problematic printer, and do a continuous ping to it from an affected station. Do you see packet loss? Also what do the packet counts look like on your switch ports, is it possible that we have a switching/routing loop somewhere?
Apr
3
comment Issues with connecting to network resources after segmenting network
Few questions to get started: What are the IPs/Netmasks/gateways of the various networks? What is the route table on the Mikrotik, and what interfaces are configured on it?
Feb
25
comment Take screenshot from server screen while disconnected from RDP
@NielsBrinch Sorry I don't know that one. Probably would try connecting a monitor locally and setting the resolution from a local session. See if it carries over to the console session. Alternatively I'd look for a registry setting that controlled that behavior. Since I do not have something that takes screenshots while I'm disconnected, I'd have to start with determining a way to test.
Feb
25
comment Take screenshot from server screen while disconnected from RDP
@ Simon Although you can't log into it via the usual mstsc switch, you can still see it there when you run query session.
Feb
25
comment Take screenshot from server screen while disconnected from RDP
It appears that thecleaner was right. Disconnected rdp session aren't drawn at all. Even minimizing them would cause trouble. Using /dest:console as a placeholder, or an alternative remote access tool like VNC are the only workarounds.
Feb
21
comment Joining subnets over multiple Sonicwall interfaces
Yes that looks correct. Now you would just need to make sure that X3 and X4 trust each other. IIRC sonicwall does this with 'trusted zones' and 'trusted interfaces'.
Feb
21
comment Wrong Gateway assigned
What does the arp table on the 10.0.1.1 look like?
Mar
9
comment Fresh CentOS 6.2 / Ubuntu Server Installation on VMWare ESXi - can connect to LAN net but not Internet
@cjc It was NAT'ed but still using an internal IP rather than external. So 8.8.8.8 received a ping it couldn't route back to. Good catch Max
Mar
9
comment Fresh CentOS 6.2 / Ubuntu Server Installation on VMWare ESXi - can connect to LAN net but not Internet
If you wish to specifically examine the differences. Capturing the same info from a working windows box would be a good baseline. So a capture of a successful background ping with layer2 info.
Mar
9
comment Fresh CentOS 6.2 / Ubuntu Server Installation on VMWare ESXi - can connect to LAN net but not Internet
Local interface entries? I'm curious if we have a router that's trying to route back to the wrong interface. Tcpdump on the wan side will also show if those pings are making it through the firewall. It's possible those pings are going out then just not making it back