01-06-2010
Quote:
Originally Posted by
sysgate
I would suggest to try different tools like "mtr" or "tcptraceroute" and post the results
No change - similar results - missing the default gateway hop on ingress traffic.
I suspect it must be something to do with the vlan since the default gateway is one of those enterprise managed switches (think Cisco/Juniper - this one's an older Foundry) - quite possibly the switch is changing between routed and bridged mode or something based on which way the packets travel.
Like I say, it's one hop less so I'm not really concerned about "fixing" this issue.
It does seem strange that a packet could appear to bypass the physical network layer tho
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VCONFIG(8) System Manager's Manual VCONFIG(8)
NAME
vconfig - VLAN (802.1q) configuration program.
SYNOPSIS
vconfig [lots of long options]
DESCRIPTION
The vconfig program allows you to create and remove vlan-devices on a vlan enabled kernel. Vlan-devices are virtual ethernet devices which
represents the virtual lans on the physical lan.
OPTIONS
add [interface-name] [vlan-id]
Creates a vlan-device on [interface-name]. The resulting vlan-device will be called according to the nameing convention set.
rem [vlan-device]
Removes the named vlan-device.
set_flag [vlan-device] 0 | 1
When 1, ethernet header reorders are turned on. Dumping the device will appear as a common ethernet device without vlans. When
0(default) however, ethernet headers are not reordered, which results in vlan tagged packets when dumping the device. Usually the
default gives no problems, but some packet filtering programs might have problems with it.
set_egress_map [vlan-device] [skb-priority] [vlan-qos]
This flags that outbound packets with a particular skb-priority should be tagged with the particular vlan priority vlan-qos. The
default vlan priority is 0.
set_ingress_map [vlan-device] [skb-priority] [vlan-qos]
This flags that inbound packets with the particular vlan priority vlan-qos should be queued with a particular skb-priority. The
default skb-priority is 0.
set_name_type VLAN_PLUS_VID | VLAN_PLUS_VID_NO_PAD | DEV_PLUS_VID | DEV_PLUS_VID_NO_PAD
Sets the way vlan-device names are created. Use vconfig without arguments to see the different formats.
NOTES VLAN will use Broadcom's NICE interface when the network device supports it. This is necessary, since usually the hardware of these
devices already removes the vlan tag from the ethernet packet. The set_flag option on vlan-devices created on such a physical net-
work device will be ignored. Dumping the network-device will show only untagged(non-vlan) traffic, and dumping the vlan-devices
will only show traffic intended for that vlan, without the tags.
FILES
/proc/net/vlan/config
/proc/net/vlan/[vlan-device]
SEE ALSO
ip(8), ifconfig(8)
AUTHORS
This manual page was written by Ard van Breemen <ard@kwaak.net>
The vlan patch is written by Ben Greear <greearb@candelatech.com>
VCONFIG(8)