tcpdump mailing list archives
Re: odd issue with Linux VLAN interface
From: Michael Richardson <mcr () sandelman ca>
Date: Tue, 27 Jan 2015 20:20:26 -0500
Denis Ovsienko <denis () ovsienko info> wrote: > The host has an Ethernet interface with only an IPv6 link-local address > (eth0). On top of it there is a VLAN interface with VID 75 (eth0.75), > IPv6 link-local address and IPv4 address 10.0.75.254/24. The difference > is, when tcpdump runs with "-i eth0.75", it works as expected and > displays ARP and, for instance, UDP from/to the network > 10.0.75.0/24. When run with "-i eth0", it displays only TCP from/to > network 10.0.75.0. This looks wrong in two ways as the tagged packets > should not appear on the bearing interface in the first place and even > if they appear there the filter should exclude them, but instead of > this it excludes all the other packets. Tagged packets do appear, and if you add -e, you'll see the entire tag there too. At this point, it's hard to get the behaviour I think you want from the pcap compiler, which is to filter the traffic within the VLAN from the bearer. (I think that showing the tcp packets might be a fluke) -- ] Never tell me the odds! | ipv6 mesh networks [ ] Michael Richardson, Sandelman Software Works | network architect [ ] mcr () sandelman ca http://www.sandelman.ca/ | ruby on rails [ _______________________________________________ tcpdump-workers mailing list tcpdump-workers () lists tcpdump org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Current thread:
- odd issue with Linux VLAN interface Denis Ovsienko (Jan 27)
- Re: odd issue with Linux VLAN interface Guy Harris (Jan 27)
- Re: odd issue with Linux VLAN interface Denis Ovsienko (Jan 27)
- Re: odd issue with Linux VLAN interface Guy Harris (Jan 27)
- Re: odd issue with Linux VLAN interface Denis Ovsienko (Jan 27)
- Re: odd issue with Linux VLAN interface Michael Richardson (Jan 28)
- Re: odd issue with Linux VLAN interface Denis Ovsienko (Jan 27)
- Re: odd issue with Linux VLAN interface Guy Harris (Jan 27)
- Re: odd issue with Linux VLAN interface Denis Ovsienko (Jan 28)
- Re: odd issue with Linux VLAN interface Michael Richardson (Jan 28)