Dan Nelson wrote:
In the last episode (Feb 12), Andrew P. said:
Dan Nelson wrote:
In the last episode (Feb 12), Andrew P. said:
I have a few machines behind my FreeBSD box. The box connects to
ISP via ppp (PPPoE protocol). It's all working very nicely, but the
ISP is a pain - it disconnects every 24 hours. I can reconnect in
just a moment - so the diconnect is usually less than a second
long, but many applications, like ICQ/MSN and games "feel" the
disconnect. The matter is that these applications can handle fairly
large packet loss (e.g. Counter-Strike can cope with at least
15-second long 100% packet loss), but AFAIK it's in the nature of
the TCP/UDP that a disconnect is a disconnect.
As I know that FreeBSD is full of magic, is there any way to
conceal these reconnects as short moments of 100% packet loss? I am
ashamed to know very little about protocols' technicalities, but
I'll look into any sources you advise.
Check to see if your IP number changes when you reconnect. If it
does, there's nothing you really can do; the remote system you were
talking to knew you only by your old IP, and those packets coming to
them from this other IP are unrelated.
It changes only once in about a week. Let's say it doesn't change
at all. What then?
I'm still suspicious :) The two most common causes for connection
resets are IP address changes and NAT resets. /usr/sbin/ppp keeps its
NAT table across disconnects as long as the process itself stays
running, so I don't think that's the cause. If you have root access to
a remote system, try running tcpdump on it and your local machine while
running something like top over ssh, and watch what happens when your
connection drops and reconnects.
No, there's really nothing to be suspicious about :) The IP doesn't
change (well, in the process of IPCP it virtually does, first to
10.0.0.1/0 and then back to the assigned one - but that doesn't
count, does it), the ppp process stays, but TCP/UDP streams are
somehow interrupted. Don't worry anyway. Disconnects happen in
5-6 in the morning, when all the users are sleeping and the only
one sleepless surfer is unlucky me, trying to seamlessly upgrade
self-made internet connection sharing box from 4.10 to 5.3.
BTW, if only anyone happens to know: I asked list before, but got
no reply. When ISP actually assigns new IP address, I occasionally
get double IPs on the tun0 interface (the old one and the new one
simultaneously). Everything's working fine, but the dyndns updater
can't recognize the IP change. Is there a way to fix this glitch/
feature? I've really manned and googled for it - without succes.
Best wishes,
Andrew P.
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