On your switch configs did you set gratuitous arps to no? Suggested by ESX support and knowledgebase.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Cook Sent: Thursday, April 03, 2014 5:17 PM To: [email protected] Subject: RE: [NTSysADM] No communication between VMs on an ESXi host Well we do it for our SAN traffic, no reason it wouldn't work on guests. John W. Cook Director of Network Operations Partnership For Strong Families 5950 NW 1st Place Gainesville, Fl 32607 Office (352) 244-1610 Cell (352) 215-6944 MCSE, MCP+I, MCTS, CompTIA A+, N+, Security + VSP4, VTSP4 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Kurt Buff Sent: Thursday, April 3, 2014 4:59 PM To: [email protected] Subject: Re: [NTSysADM] No communication between VMs on an ESXi host Which would mean multihoming the VMs, correct? I don't think that's the right approach here... Kurt On Thu, Apr 3, 2014 at 1:50 PM, John Cook <[email protected]> wrote: > Add another virtual switch with a private range for communication between > servers? > > John W. Cook > Director of Network Operations > Partnership For Strong Families > 5950 NW 1st Place > Gainesville, Fl 32607 > Office (352) 244-1610 > Cell (352) 215-6944 > > MCSE, MCP+I, MCTS, > CompTIA A+, N+, Security + > VSP4, VTSP4 > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Kurt Buff > Sent: Thursday, April 3, 2014 4:44 PM > To: [email protected] > Subject: Re: [NTSysADM] No communication between VMs on an ESXi host > > Sorry, forgot to add - only one VLAN on this switch, and the physical switch > ports are tagged to this VLAN, and of course all of the VMs are on this VLAN, > and are using the VMX NET 3 NIC. > > Kurt > > On Thu, Apr 3, 2014 at 1:39 PM, Kurt Buff <[email protected]> wrote: >> All, >> >> My search-fu is failing, so I turn to you for help... >> >> I have a small ESXi 5.5 host, about to go into production. >> >> The three VMs (2008R2 for all of them, a DC, Exchange 2010 and a PRTG >> box) on it can communicate with machines not on the ESXi host - ping, >> RDP, etc. - and vice versa. No problems. >> >> However, the three VMs on this host cannot talk with each other. No >> ping, no RDP. When pinging from one of the VMs to another, I get a >> mix of unreachables from the VMs own address and straight timeouts. >> >> There is only one vSwitch, which has two NICs bound to it, and the >> vswitch is set up to route based on IP hash. The physical switch to >> which they are connect (and this shouldn't matter, but...) is an HP >> 2510G-48, and the ports for the host are in a simple trunk - no LACP. >> >> I've turned off the Domain profile of the firewall on one of the >> machine, which seems to make no difference. >> >> I've examined the VMware host security settings to no avail. I've >> turned off the Windows firewall. >> >> I've got 3 ESXi hosts in a vSphere Standard cluster that doesn't have >> this problem. >> >> Kurt >> >> > > > > ________________________________ > > CONFIDENTIALITY STATEMENT: The information transmitted, or contained or > attached to or with this Notice is intended only for the person or entity to > which it is addressed and may contain Protected Health Information (PHI), > confidential and/or privileged material. Any review, transmission, > dissemination, or other use of, and taking any action in reliance upon this > information by persons or entities other than the intended recipient without > the express written consent of the sender are prohibited. This information > may be protected by the Health Insurance Portability and Accountability Act > of 1996 (HIPAA), and other Federal and Florida laws. 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