Lukas Tribus wrote: > >> Are there any IP filters on the layer 2 side of this? Are you using CoPP > >> and > >> the IP is denied there? > > > > No. PASOLINK does not do IP filtering. > > > > It can only do some Ethernet frame filtering, like filtering out LLDP > > or STP frames, but no such filters are even configured. > > Just because its not configured or not configurable doesn't mean its not > actually doing it (it may be a bug). > > I have an Ethernet over FrameRelay Radio PTMP system that after a few > months of uptime inserts the UDP payload of customer A into the > TCP payload of customer B (customer B using this TCP session to > transfer files to a AS400 that doesn't check TCP checksums and > therefor the UDP payload of customer A makes it into the application > of customer B). The only fix here is to reload the whole system. > > The very same PTMP system sometimes drops traffic of a certain mac > address, although there are no layer 2 rules (other that different > vlans).
Cool story. We have set up port monitor sessions in various parts of the network and have found out the following. One of the C3560X-24P in the chain of identical switches does not let through packets with src=10.65.127.246&dst=224.0.0.5. Neither when such packets transit the switch nor when it's configured on one of it's own Vlan interfaces. Other switches in the chain are identical from the hardware/software point of view, and configured almost identically, but do not suffer from the problem. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:suda...@sibptus.tomsk.ru _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
