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Re: [Xen-users] xen and .1q vlans
| To: | xen-users@xxxxxxxxxxxxxxxxxxx |
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| Subject: | Re: [Xen-users] xen and .1q vlans |
| From: | Javier Guerra <javier@xxxxxxxxxxx> |
| Date: | Tue, 19 Dec 2006 16:53:59 -0500 |
| Delivery-date: | Tue, 19 Dec 2006 13:54:20 -0800 |
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| In-reply-to: | <200612191539.13933.alessio.mineni@xxxxxxxxxxxx> |
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On Tuesday 19 December 2006 9:39 am, Alessio Mineni wrote: > It happen that I can "ping" the DomU but I can't "ssh" on it; the netstat try different ping packet sizes (eg: ping -s 1500), several common problems with vlans affect only packets over 1496 bytes long. check that eth1's MTU is at least 4 bytes bigger than vlanX's MTU. if vlan2 has an MTU of 1500, eth1 must have at least 1504. some people like to turn down vlanX MTU to 1496, but that doesn't work if the vlan device is used for bridging and not routing. (that's because the MTU discovery is done watching for the 'fragmentation needed' ICMP packets, but a bridge doesn't fragment, it simply drops what it can't handle) -- Javier
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