Messages in this thread |  | | | Date | Fri, 25 Jul 1997 22:59:40 -0400 (EDT) | | From | "Richard B. Johnson" <> | | Subject | Strange Network behavior |
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Hello, Thanks to many of you, I now have the firewall running on my PPP server. It gets rid of the Micro$oft garbage from WIN-NT and WIN-95 beasties.
While experimenting, I noticed something that I don't understand --err well there are a lot of things I don't understand, but this one bothers me a bit.
If I kill all the deamons `kill -9 -1`, I would expect that the Linux machine would be a quiet machine on the network. Not so. It periodically does an ARP for 204.178.40.255, 204.178.41.255, 42.255, etc. The network address is 204.178.40.0, netmask is 255.255.248.0. Why would it be ARPing a broadcast address? In principle, with a netmask of 255.255.248.0, the broadcast address should be 204.178.47.255, but many machines use the broadcast address of each 'C' subnet, i.e., 40.255, 41.255, 42.255, etc.
Why would a Linux machine with no `known` network activity even care about ARPing these addresses? It seems real strange. The ARP cache contains these addresses, put there I think, when the machine was configured for routing and transparent proxy:
cisco.analogic.com IP 204.178.40.1 HW 00:00:0C:0A:3E:D3 boneserver.analogic.com IP 204.178.40.210 HW 08:00:00:85:63:33 unknown host IP 204.178.41.255 HW 00:00:00:00:00:00 quark.analogic.com IP 204.178.40.236 HW 00:00:00:00:00:00 unknown host IP 204.178.42.255 HW 00:00:00:00:00:00 skunkworks.analogic.com IP 204.178.40.100 HW 08:00:00:30:91:73 unknown host IP 0.0.0.0 HW 00:00:00:00:00:00
I do not use the routed daemon. Only static routes are configured.
I think that these addresses are being `expired` and the network code attempts to `refresh` them by sending the ARP who-is message on the LAN. If so, this might be a tiny bug.
Cheers, DJ Richard B. Johnson Analogic Corporation Penguin : Linux version 2.1.44 on an i586 machine (66.15 BogoMips). Warning : It's hard to stay on the trailing edge of technology. Linux : Engineering tool Windows : Typewriter
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