>But since a couple of days something very strange is happening: > >- The machine becomes unreachable, no one is able to ping it >- My whole network starts receiving some very heavy traffic & collisions >from the IMGate box, making almost all my machines in our LAN totally >unreachable or at least with very heavy packet lost until the IMGate box >is rebooted >- If I login directly into the IMGate box while this is happening >everything looks normal, besides that I can't also reach other hosts, >but there aren't any strange processes, heavy use, etc.
dmesg | less check /var/log/messages check for I/O colliisions and errors: netstat -bi postfix stop see if the network calms down postfix start you may under SMTP attack ps aux | egrep -ic "smtpd" and compare that number with what is in master.cf Len >As I said after I reboot everything goes back to normal for a couple of >hours or more than a day, some days I have to reboot it more than once, >like today: 3 times so far. So this is happening at any time. > >Do you have any ideas on what's happening? Has something like this >happened to any of you? What I should do to avoid this from happening? > >Could this be some kind of attack or maybe I have a faulty NIC? If it's >the NIC the strange thing is that behaves well for several days >sometimes, but lately is happening more often. > >My box details: > >Intel Pentium III 700Mhz >768MB RAM >20GB Hard Disk >3Com 3c905B-TX NIC >FreeBSD 4.7 >Postfix 2.0.16 (snapshot) > >The partitions have light use: > >Filesystem 1K-blocks Used Avail Capacity Mounted on >/dev/ad0s1a 395238 37898 325722 10% / >/dev/ad0s3e 5155508 328844 4414224 7% /usr >/dev/ad0s4e 12666974 1354134 10299484 12% /var >procfs 4 4 0 100% /proc > >Any help it's very appreciated. > >Adolfo Justiniano >Santa Cruz BBS >e-mail: [EMAIL PROTECTED] >http://www.scbbs.net > >--- >[This E-mail was scanned for viruses by the Santa Cruz BBS anti-virus system]
