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Jul
22
comment Why does OS X spend one more packet to establish and close a TCP connection?
tcpdump is perfectly valid for looking at this. The information is not easier to access in wireshark if you have to 1) install a GUI, 2) install wireshark.
Jul
22
comment Why VM cannot get the public IP I have from provider?
How about an ifconfig -a on the VM?
Jul
20
answered Allocated Memory difference in xen guests with Linux 2.6.18 and 2.6.32
Jul
20
revised PCI Compliance Network Scan Issue - HTTP response code was an expected 401
Corrected typo.
Jul
20
comment Reviewing firewall rules
RedSeal is more than just firewall rules, they do all kinds of stuff to help visualize your network security architecture, including determining if your current access control stance (implemented via firewalls, ACLs, etc.) is complaint with your desired company "policy" (or other standards, such as PCI-DSS, et al). As far as firewall rules go, they can analyze for a bunch of Best Practice checks, in addition to some firewall specific stuff such as unused rules, missing logging, etc. for a variety of different vendors.
Jul
20
reviewed Reject How to integrate /home back into main partition, then grow partition
Jun
26
revised Debating our network structure (DMZ, database, service)
Added more information.
Jun
26
answered Debating our network structure (DMZ, database, service)
Jun
11
comment How to restore Ubuntu server on a VMWare image after disk failure?
You probably need to mount specific partitions: "/dev/sdb3" or similar. Try "sudo fdisk -l /dev/sdb" to see what might be available.
Jun
10
comment How to restore Ubuntu server on a VMWare image after disk failure?
If you really have to "recover" it, i.e. make the actual same image bootable again, then yea, probably run the rescue process. Otherwise, just copy off your configs and data and you are all set (I've found that this tends to get much more reliable and consistent results, and I don't end up spending hours troubleshooting weird boot parameters and grub issues that I don't really understand.)
Jun
10
answered How to restore Ubuntu server on a VMWare image after disk failure?
Jun
10
comment How does server handle multiple clients on the same port? Multiple sockets or multiple ports?
I second the recommendation for TCP/IP Illustrated.
May
28
comment How to connect the virtual networks of vmware guests running on different hosts?
Do the VMs all need to communicate with each other? Or just the host(s)?
May
28
comment How to connect the virtual networks of vmware guests running on different hosts?
Do the VMs all need to be on the same broadcast domain (i.e. subnet)?
May
26
comment GRE tunneling in vmware vsphere guest
The answer to this question is "Yes". But a one word answer is too short for a real answer, so I'm suggesting that you elaborate on your question with details on why you think it might not work and what your actual question is.
May
25
answered Network request intercept preventing local connections
May
24
comment XenServer - Does the Hypervisor act as a router?
You could also create other vSwitches that aren't connected to a physical nic at all, to prevent broadcast or other traffic from being sent on the wire, although that clearly isn't the default configuration.
May
24
comment XenServer - Does the Hypervisor act as a router?
The default behavior is to create a virtual switch for each physical NIC in the system, and connect VMs to the first vSwitch that is created. If the VMs are just communicating with each other, and are on the same subnet, then the traffic won't leave this vSwitch (e.g. you could have the physical NIC disconnected and it would still work).
May
24
answered XenServer - Does the Hypervisor act as a router?
May
23
answered Why don't more organizations use inside-to-inside NAT or similar solutions to allow NAT hairpins?