Linux-Networking Digest #712, Volume #11 Tue, 29 Jun 99 01:13:32 EDT
Contents:
DHCP flooded cable network!! ("Ed Davis")
Re: Newbie question (Gary Helbig)
Re: Works now IP MASQ and Samba needs to work????? (Chuck Snively)
unknown ip on network (Harry Park)
Re: IP Multicast Routing Protocols (Jason X Pacheco)
Re: nfs mount a drive on NT to redhat linux? (Jason X Pacheco)
Re: IPMASQ behind my dumb universities firewall (Jason X Pacheco)
Qmail setup for POP3 ("Wiley Coyote")
Re: If I had a gun.... (Jos Hartman)
D-Link530, "make" 1st step?? (Rich ''Doc'' Colley)
Re: Gaming over a shared internet connection? (Jason X Pacheco)
New PPP Tutorial (Hubert Orlick)
Re: Why not C++ (Nathan Myers)
I need to put Tulip drivers in - recompile?? ("matsonfamily")
Re: Routing two Internet Networks (Ben Short)
Proxim Symphony ([EMAIL PROTECTED])
----------------------------------------------------------------------------
From: "Ed Davis" <[EMAIL PROTECTED]>
Subject: DHCP flooded cable network!!
Date: Tue, 29 Jun 1999 01:53:11 GMT
Hi,
I have had Linux running for almost a year now using ipfwadm to connect 2
other home computers running windoze. Today the cable internet provider
called me and said they had to shut down my connection because I was
flooding the network with requests for an IP address, thousands of requests.
They said either I had a wrong DHCP configuration (stock redhat config) or
I had been hacked. This Linux box has been just sitting there running nicely
for a long time. Has anyone heard of this, it's a Redhat 5.2 distribution.
Can't imagine being good for a year then crash. Needless to say I have put
windoze on after I was told I could be terminated as a customer if it
happened again. Any insight would be appreciated and might help someone else
avoid this.
Thanks
Ed
------------------------------
From: Gary Helbig <[EMAIL PROTECTED]>
Crossposted-To: redhat.networking.general
Subject: Re: Newbie question
Date: Mon, 28 Jun 1999 20:20:06 -0700
Hi,
You need to understand the difference between switching and routing.
Here's an analogy:
Imagine that your network is a lot of people sitting around a table.
The "data" would be cards with the persons name on them. With no
switching or routing, all of the cards are placed on the table so
everyone can read all the names. A person would read all of the cards
with their name on them, and ignore the cards with someone else's name
on them.
Then your group (network) gets too big for everyone to sit at the same
table. So you split the group in two, and put them at separate tables.
Now you have to add a new member; this person will be the switch, or
the router.
In a switched network, the new person knows who's on table one and
table two. He will take all the cards that were for people on table 1
and turn them so only people on table 1 can see them. And the converse
for table two. This way, there's a lot less cards to ignore when
looking for yours. But the switch has to know who's at each table. And
the tables can't be too far apart.
In a routed network, this person would pick up all the cards on table 1
that are for table 2, and carry them over to table 2. And bring the
cards from table 2 for table 1 back. When he's at table 1, all he has
to know is who's on table 1; the cards are divided into table 1 and
'other'. And the tables can be any distance apart.
In a small network, there's no real difference between switching and
routing. Switching is usually a little faster (less latency), but
that's it.
In a large network, the switching table get unmanagable, and you have
to route.
And remember; MAC addresses exist only for ethernet. As soon as you
"go WAN", you loose the MAC, and have to route.
Does this clear it up any?
Gary.
Pim wrote:
>
> I'm relatively new to the networking world so I've read some White Papers
> and FAQ's on the Internet.
>
> Now I do understand the advantages (switching) routers have when compared to
> Layer 2 switches in the area's security, load balancing, WAN interfaces,
> broadcast containment etc.
> But when only routing is concerned, I just don't get the benefit of using a
> router (or Layer 3 switch) instead of a Layer 2 switch.
>
> Quote from some White Paper:
>
> ....Because of their dependence upon MAC addresses, LAN switches are
> restricted to forwarding of traffic at Layer 2. Any traffic destined for a
> different subnet *must* be forwarded to a router, which uses Layer 3
> information (e.g., IP addressing) to determine the next hop through the
> network....
>
> and:
>
> ....This ability to cache Layer 3 address tables is the key differentiator
> between router accelerators and Layer 2 switching products. Layer 2 switches
> must send all inter-subnet traffic to a router for path resolution, whereas
> router accelerators can intelligently forward traffic based on Layer 3
> information if the address is already contained within its cached address
> tables....
>
> But why ? Besides src/dest IP-addresses, the packets also contains src/dest.
> MAC-addresses so by using it's MAC address forwarding table the Layer-2
> switch can do the same ?
> Suppose several endstations as well as several other Layer-2 switches are
> connected to a Layer-2 switch. Then the Layer-2 switch is able to "route"
> inter-subnet traffic to the port to which one of the other Layer 2 switches
> is connected to which the target endstation is connected ?????
>
> Please help me out on this one. Thanks in advance.
>
> Pim
------------------------------
From: Chuck Snively <[EMAIL PROTECTED]>
Crossposted-To:
linux.redhat.announce,linux.redhat.digest,linux.redhat.install,linux.redhat.list,linux.redhat.misc,linux.redhat.rpm,linux.samba
Subject: Re: Works now IP MASQ and Samba needs to work?????
Date: Mon, 28 Jun 1999 23:33:18 -0500
Scott wrote:
> Read the IP Masq Howto, and goto http://ipmasq.cjb.net
>
> Matt Goebel wrote:
> >
> > Thanks guys for all the info. I got my cable modem working now. All I need
> > was to call Mediaone and have them change the MAC to that of the card in my
> > Linux box, set it to use DHCP, and install the pump patch. Works great now.
> > I've also got my 2nd network card in the Linux box to work. Now I need help
> > getting my other machines (Windows 98) to use it as a gateway to the
> > internet via IP Masq. Since I'm using Redhat 6 (kernel 2.2.5) I think
> > support for this is built in and I won't need to recompile the kernel?? I
> > also need to get Samba to work. At the moment all I can go with the 2nd NIC
> > is ping the other machines and vice versa.
> > Nick <[EMAIL PROTECTED]> wrote in message
> > news:eRW13.14267$[EMAIL PROTECTED]...
> > > > The version of pump supplied with 6.0 does not work with roadrunner. At
> > > > least I have found this to be so. The updated version does work. You can
> > > > either get the updated version of pump or edit '/etc/resolv.conf'. I bet
> > > > if you look at /etc/resolv.conf you won't see your nameservers, only the
> > > > word search. Hope this helps.
> > >
> > > I used RH6 to do a complete install and during initialisation I set it to
> > > configure dhcp for RoadRunner. It worked first time and all I needed
> > > to add was a default gateway route to the routing table. Use linux-conf
> > > for this.
> > >
> > > Nick
> > >
> > >
>
> --
> Proudly sent with linux.
I am running RH 5.2 and all I did was add two lines in my /etc/rc.local file:
ipfwadm -F -p deny
ipfwadm -F -a m -S 192.168.x.x/"A" -D 0.0.0.0/0
You enter a line like the second one everytime you want to allow a particular
machine to access the internet.
The "A" is your netmask. You can enter:
8 for class A network or 255.0.0.0
16 for class B network or 255.255.0.0
24 for class C network or 255.255.255.0
32 for Point to Point or 255.255.255.255
For your client machines (Win 98):
1. Add a TCP/IP adapter
2. In TCP/IP properties go to IP Address and set it to 192.168.x.x and the
netmask as the one you need. 255.255.255.0 for this group of IP
addresses.
3. Under Gateway enter the IP of your Linux box.
4. Under DNS Configuration/DNS search order, enter the IP address of the DNS your
linux box uses.
5. Click 'OK' on all dialogue boxes and reboot.
Hope this helps.
Chuck
------------------------------
From: Harry Park <[EMAIL PROTECTED]>
Subject: unknown ip on network
Date: Mon, 28 Jun 1999 20:22:33 -0400
I run NTOP on our LAN. This LAN is part of a WAN that is firewalled. I
have no control over the firewall.
I noticed an IP address had downloaded 450 megs from somewhere on my
LAN. I tried pinging the address and
couldn't reach it from my LAN ditto http and nslookup.
I came home and logged on to my ISP. I could ping the ip but could not
ftp, telnet, or http to the address. Nslookup
failed.
I should also note that NTOP reported most of the traffic asUDP.
My question is how do I figure out what happened? Is there anyway of
determing what the IP is?
Harry
------------------------------
From: Jason X Pacheco <[EMAIL PROTECTED]>
Subject: Re: IP Multicast Routing Protocols
Date: Mon, 28 Jun 1999 23:53:05 -0400
i may be wrong but am pretty sure distance vector is used more .
-jxp
[EMAIL PROTECTED] wrote:
> Hi,
>
> Does anyone know which of the following IP multicast routing protocols
> is most widely used.
>
> 1. DVMRP (Distance Vector Multicast Routing Protocol) 0r
> 2. PIM-SM (Protocol Independent Multicast - Sparse Mode)
>
> Thanks,
> Ravi
>
> Sent via Deja.com http://www.deja.com/
> Share what you know. Learn what you don't.
------------------------------
From: Jason X Pacheco <[EMAIL PROTECTED]>
Subject: Re: nfs mount a drive on NT to redhat linux?
Date: Tue, 29 Jun 1999 00:26:30 -0400
i believe u can use pc-nfs on nt to do that...it's probably just easier
to share the directory on NT and use samba on ur linux box to mount it.
besides, samba is free :)
good luck
-jxp
[EMAIL PROTECTED] wrote:
> Is it possible to mount a directory/drive on NT to my linux box so
> that I can see it on my linux?
>
> Is there any NFS server for NT that can do this?
------------------------------
From: Jason X Pacheco <[EMAIL PROTECTED]>
Subject: Re: IPMASQ behind my dumb universities firewall
Date: Tue, 29 Jun 1999 00:06:39 -0400
well the reason the universitie's firewall doesn't allow you to ping, is it
probably drops all ping packets, to prevent some punk from ping flooding
the network. ... ur win98 box should be able to access web pages and do
everything ur linux box does if ip masq is set up right...hmm...it's pretty
odd.right now i can't think of a reason why...are u using IPchains or
ipfwadm? .... what happens when you try to laod a web page on the 98 box?
does it time out, give you any sorta error?
David Summers wrote:
> Here's my situation: I live on campus and have a direct connection to
> the Universities network via ethernet (well, there's an ISDN between us,
> but I am not on an ISDN modem). The university has a firewall, and I
> don't know much anything about firewalls but basically I can do passive
> FTP transfers, I can surf the web just fine (at about 60k..remember the
> ISDN) and I can also use ICQ, heat.net, and certain TCP/IP network games
> such as Quake. I cannot ping outside sites (it always times out) or play
> games using MS DirectPlay. I don't understand why I can view internet
> sites, download, etc. but can't ping. Frankly I hadn't really cared
> untill now.
>
> Anyway, I setup a small tcp network using Linux (mandrake 5.3) as a
> server connected to the internet through eth0 and to a Win98 box through
> eth1. I can do all the internet stuff described above on the Linux box,
> and I can ping to my hearts content between Linux and Win98 (I used
> class C private network IP addresses). I can also telnet from Win98 into
> linux. I cannot ping outside addresses from either box, nor can I access
> any internet pages from the Win98 box. I am fairly certain I set up
> IPMASQ correctly because I can ping (from Win98) IP addresses on the
> Universities network that are on my side of the (Universities) firewall.
> Is my assumption correct that IPmasq is probably running correctly since
> this is possible?
>
> So do any of you have any tips on giving my Win98 machine the same
> internet priveledges my Linux box gets? Remember, the Linux box
> (actually any machine hooked directly to the universities network) can
> view web pages, use ICQ, download, etc. but cannot ping anything (even
> pages that are open in Netscape at the same time..how strange to me). I
> have read both the NET-3 HOWTO and the IPMASQ mini HOWTO.
>
> Thanks so much for yourtime.
>
> David
> [EMAIL PROTECTED]
------------------------------
From: "Wiley Coyote" <[EMAIL PROTECTED]>
Subject: Qmail setup for POP3
Date: Mon, 28 Jun 1999 20:56:13 -0700
I cannot figure out what I have done wrong setting up my Qmail server.
I am trying to setup an email server accessible by my POP3 clients
(Windows9x) on our network. At this point, I cannot even check for
mail on the local machine.
Using the FAQ installed with Qmail, I have done the following
/etc/services contains the following:
pop3 110/tcp
pop3 110/udp
I have noticed in pop-2 the '-'. Should this also be in pop3 (ie pop-3
tcp/110)?
in etc/inetd.conf I have added the following:
tcpserver -u 81 -g 80 0 smtp /var/qmail/bin/qmail-smtpd &
tcpserver 0 pop3 /var/qmail/bin/qmail-popup Linus.mydomain \
/bin/checkpassword /var/qmail/bin/qmail-pop3d Maildir &
At one time, there was a line saying:
pop-3 stream tcp nowait root /usr/sbin/tcpd ipop3d
but this line has now been deleted. I don't recall if I was instructed
to delete it. Is this line necessary?
I have also run
makemaildir ~/Maildir
echo ./Maildir/ > ~/.qmail
I have configured KMail to receive email from POP3 server
entering my ip address as the server, and my Linux login and password
to make the connection.
When I attempt to receive email, I get a "Pop Mail Error" window stating:
Account: Linux
In: Open
Unknown error 4294967295.
I am also unable to telnet <myipaddress>:110
Thankyou in advance for any assistance,
Steve B
------------------------------
From: Jos Hartman <[EMAIL PROTECTED]>
Subject: Re: If I had a gun....
Date: Mon, 28 Jun 1999 22:32:40 +0000
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OK, I don't know which dist you use. I am using SlackWare and have
exactly what you've got. On the Linux box, the script /etc/rc.d/rc.inet1
gets executed at boot time. I think you have the same maybe.
Following is my scenarios
+-------+ +---------+
+ + + +
+ Linux +---------------------------------+ Windows +
+ + 192.168.2.1 192.168.2.2 + +
+-------+ +---------+
On the Linux side, the tcp/ip addr is as follows:
IP: 192.168.2.1
Netmask: 255.255.255.0
Broadcast: 192.168.2.255
Forget the gateway.
On the Windows side, set up as follows
IP: 192.168.2.2
Netmask: 255.255.255.0
Also no gateway.
Attached, I have added my /etc/rc.d/rc.inet1 script.
If U use this, it should work.
Otherwise, mail me the result and I will help.
Jos Hartman
CAVOK Software Systems Ltd
e-mail: [EMAIL PROTECTED]
Tel: +41 (0) 79 676 11 23
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------------------------------
From: Rich ''Doc'' Colley <[EMAIL PROTECTED]>
Subject: D-Link530, "make" 1st step??
Date: Mon, 28 Jun 1999 20:47:47 -0700
New to Linux. Not to computers.
Have installed 5.2RH and then just updated
to 6.0. All went well, but I have yet to get
the D-LINK 530TX to be functional.
I HAVE the 'via-rhine.c' driver. BUT NOT sure
exactly how to 'compile it' (I have two Linux
books, the one that came with 5.2 and one by
Barkati -Linux Secrets [still a secret to me])
I wasn't able to use either to get anywhere with this
problem so I found the via-rhine.c driver and site
and read the instructions.
1. When I read that perhaps I should compile a device
driver module, I kinda "THINK" that the via is already???
2. When I try to test it, it's in /stuff right now, using
INSMOD VIA-RHINE.C it indicates it is not an ELF file??
I haven't figured out where to go from that error???
Also, attempting to use the "MAKE" command results in
'command not found'... for instance 'make include/linux/version.h'
MY */usr/src/linux* is actually /usr/src/linux-2.2.5
that is wierd... well, thanks.
--
Rich "Doc" Colley
CNE4
mailto:[EMAIL PROTECTED]
------------------------------
From: Jason X Pacheco <[EMAIL PROTECTED]>
Subject: Re: Gaming over a shared internet connection?
Date: Mon, 28 Jun 1999 23:56:59 -0400
if ur on a cable modem you should have no problems. depending on teh game of
course...i set up a p75 as a router for my boss and they have like 3 or 4
machines going at a time playing quake 2 on the net, and he says it's fast
and doesn't seem to be slowed down at all. you should be ok with that kinda
set up.
enjoy it ;)
DeAnn Iwan wrote:
> On Sat, 26 Jun 1999 08:27:50 GMT, Andrew Corrigan <[EMAIL PROTECTED]>
> wrote:
>
> >Hi,
> >
> >I am interested in trying out linux and was thinking of setting up a
> >relatively cheap linux box as a gateway using IP Masquerade. Two
> >Windows 98 SE boxes would be connected to the linux gateway (I figure
> >using a router?) over a cable modem. Anyways, I was wondering if anyone
> >had done a similar setup and used it for multiplayer gaming over the
> >net, primarily Halflife, Forsaken, some RTS games. I haven't seen any
> >mention of games over this setup.
> >
>
> I am in the planning stages of setting up such a network--but
> have not finished. Since there weren't other replies yet, I thought
> I'd pitch in. More than one player over the internet degrading game
> performance will depend on where the bottleneck is. A 486 can
> saturate a T1 line, so using an old machine for a router should not be
> a problem unless it's a 386. The only other place likely to be a
> bottleneck is the line out of the house (modem,cablemodem, etc.).
> Depending on the game and link speed, this could be a slowdown. The
> other link that might cause problems is the linke to the router.
> Assuming you are using a 10 mbit/s ethernet over a hub, two machines
> can adequately feed your router and a modem--assuming its something
> like a 56K getting a large fraction of that through to your ISP. Many
> machines could clog the hub, of course. This is all from theoretical
> timing and throughput, not from test.
>
> >Also, what should I be looking for in hardware. I mainly plan on using
> >it for just this purpose and some fiddling around with linux every now
> >and then (when it's not being used as the gateway). I'm thinking I can
> >save some money on a monitor but using some remote access software from
> >my Win98 computer (the other will be my roommates). Please cc any
> >replys to my email address as well. Thanks.
> >
> >Andrew
> >
>
> You can buy a little switch box that let's you connect both
> machines to one monitor. However, lower quality switch boxes (aka
> cheaper switchboxes) may have reflections that show up as ghosts on
> the monitor. Alternatively, you can just plug and unplug the monitor.
> If you are doing this a lot, go to a switchbox (the pin connector used
> on the monitor is not built for continual repluggings and you may
> eventually bend or damage a pin). I have 4 old 486s switched to one
> set of monitor/keyboard/mouse and that works fine.
------------------------------
From: Hubert Orlick <[EMAIL PROTECTED]>
Subject: New PPP Tutorial
Date: Mon, 28 Jun 1999 21:02:49 -0800
Hey, check it out. A New tutorial on getting a modem-based
PPP connection up and running under Linux:
>From Pigdog Journal (www.pigdog.org)
How Yo Git PPP T'Wawk on Yer Linux Box
http://www.pigdog.org/snatcherworld_001.html
Also check out the "Weird Linux" section:
http://www.pigdog.org/categories/weird_linux.html
CRAZY!
Bien amicalement,
Hubert Orlick
**** Posted from RemarQ - http://www.remarq.com - Discussions Start Here (tm) ****
------------------------------
From: [EMAIL PROTECTED] (Nathan Myers)
Crossposted-To: comp.os.linux.development.apps,comp.os.linux.development.system
Subject: Re: Why not C++
Date: 27 Jun 1999 16:08:19 -0700
John E. Davis <[EMAIL PROTECTED]> wrote:
> Nathan Myers <[EMAIL PROTECTED]> wrote:
>>No. _None_ of the interesting aspects of C++ templates can be emulated
>>with the preprocessor. See http://oonumerics.org/blitz/index.html .
>
>It depends on what you call interesting. Consider vecmin.cc from
>blitz which computes the minimum element of a vector. In C, I can
>define a vector type (I am not claiming that any of this is pretty):
> [code snipped]
This example appears essentially equivalent to the technique used in
the pre-template header, generic.h, that came with Cfront.
CPP macros cannot do type deduction or recursion, which is what
makes templates interestingly useful in C++, and what made it
possible (and useful) to write the Blitz++ library.
--
Nathan Myers
[EMAIL PROTECTED] http://www.cantrip.org/
------------------------------
From: "matsonfamily" <[EMAIL PROTECTED]>
Subject: I need to put Tulip drivers in - recompile??
Date: Tue, 29 Jun 1999 03:42:15 GMT
I am finding out that I probably need to recompile my Linux kernel to
support Tulip drivers (for Linksys Ethernet cards - LNE100TX). I have no
clue how to do this. All of the pages on the web that I look at seem to
just say "compile in the normal way and you're done!". I have no clue what
the "normal way" is and I am lost. Any advice?
-David
either reply to this message or send me a separate reply to
[EMAIL PROTECTED]
(take out the 'xyz')
------------------------------
From: [EMAIL PROTECTED] (Ben Short)
Crossposted-To: comp.os.linux.misc,linux.net
Subject: Re: Routing two Internet Networks
Date: Tue, 29 Jun 1999 14:02:09 +1000
In article <[EMAIL PROTECTED]>, [EMAIL PROTECTED] says...
>
> Hi, I have a question, and it might be fairly complex.
>
> We currently have two Internet connections coming into our building. My
> company hosts several web sites and does some Internet work. I'm trying
> to get re-familiar with the route daemon, and the basics on configuring
> routes.
>
> We have two Internet connections, both T1, and for simplicity I'll use
> local IP addresses.
>
> ISP #1 -- 192.168.1.0/25 (default route)
> ISP #2 -- 10.201.30.0/24 (new route, not configured)
>
> So we have the two Internet connections, and the link from ISP #1 has
> been working for over a year, just fine without problems. Now we have
> our new, ISP, ISP #2 .... which I'm trying to routes set for all IP
> addresses on 10.201.30.0/24 to go to the router, set to 10.201.30.1.
>
> In a nutshell, I want all traffic with IP addresses on the
> 10.201.30.0/24 block to route through the router on 10.201.30.1, and all
> the IP addresses on 192.168.1.0/25 to go through on 192.168.1.1. Here's
> the diagram:
>
> current default route: 192.168.1.1
>
> 10.201.30.0/24 --> 10.201.30.1 --> Internet
> 192.168.1.0/25 --> 192.168.1.1 --> Internet
>
> What my current problem is that the IP addresses set on the
> 10.201.30.0/24 block get routed through 192.168.1.1, which is the
> current default route. I've tried adding the network to Linux and
> configuring the default route for that network, but it still doesn't
> work. When I set a website to an IP on 10.201.30.0/24, all the traffic
> goes out on 192.168.1.0/25.
>
> Please advise if anyone has any thoughts on which commands I would issue
> to route the traffic to the place I want it to go to.
>
> Thanks in advance,
> --t.j. weber
>
>
>
>
> --
> T.J. Weber | Providing your business with COMPLETE
> Interplanetary Media | computer & Internet solutions!
> phone: 847.205.5200 | ----- SARRZY INTERNET SOLUTIONS -----
> fax: 847.205.5201 | web: http://www.ipmedia.net
Wouldnt you need to set the default gateway on the 10.201 IP block?
route add default gw 10.201.30.1
and similarly do the same for all other computer which use the IP block?
Ben
--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Ben Short http://www.shortboy.dhs.org
Shortboy Productions mailto:[EMAIL PROTECTED]
*Remove n0spam to email me*
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
------------------------------
From: [EMAIL PROTECTED]
Subject: Proxim Symphony
Date: Tue, 29 Jun 1999 04:41:57 GMT
The Proxim Symphony wireless lan product seems very interesting. Has
anyone successfully used it in an environment consisting of cable
modem, Windows98, NT, and Linux ?
I really like the idea of a wireless LAN, and Proxim seems to be the
only one on the block with support for both NT and Linux, but I don't
know how really good their products are, so please share your
experience.
Dan
------------------------------
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