February 2001 - Bird-users

Re: Routing server traffic thru two external ips.
by Chuck Larson 07 Mar '01

07 Mar '01

Getting some good feed back, but I am getting the impression that bird may not be the solution. A few have mentioned loadsharing, and I have looked into this. The issue with loadsharing, from what I've read, my ISP must support that two NIC can share the same IP. The is not an option for me. What I do know is that I can add a route to a specific IP to the routing table and it transmits through the second NIC(eth1), default is eth0. There is no interuption to the game and works great. So if I have 12 hosts( with unique ips ), can bird modify the routing table to put 6 hosts on eth0, and 6 on eth1? Parameters to use could be port, protocol, (bandwidth?). My previous e-mail Hi, I am new and would like to know if this is possible with bird. I currently have a game server setup behind a linux router/firewall which is hooked up to two cable modems via two NICS( eth0 and eth1 ). The idea is that if I have 12( or more ) players, how do I tell the kernel( with me telling using route ) TX packets to 6 players on eth0 and the other 6 on eth1. Any thoughts? Sincerely, Chuck Larson Linux newbie of 8 months _ _____________________________________________________________ Domain powered by www.iReg.com E-mail powered by www.1FreeEmail.com

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Re: OSPF and IPv6
by David Rohleder 28 Feb '01

28 Feb '01

Martin Mares <mj(a)ucw.cz> writes: > Hello! > > > Yes, and have 2 binaries for those protocols. Very funny. :-( > > > > I don't see any reason to make 2 binaries, when architecture of your > > programm can easily support both protocols. > > The decision whether to support both protocols in a single binary or not > was very hard, but I don't regret what we had chosen. Else we would get > a ton of extra complexity in all the interfaces and data structures, all > addresses would have to be tagged with address types, route entries would > have to be either sized dynamically or according to the largest address > type used, leading to much slower and space consuming result. In fact, > I think this was one of the principial design failures of Zebra. > > Also, IPv4 and IPv6 are two worlds which have only a little in common, > namely the network interfaces they live on, hence it makes very little > sense to combine them to a single program. Ok then. But when doing ./configure you say --enable-ipv6 . No even a simple word about effectively disabling ipv4 :-( > > > Otherwise, there should be 2 binaries with different names - because > > they do 2 different things. > > > > bird-ipv4 and bird-ipv6 > > > > Think about adding BIRD to for example Debian distribution. If there > > is only one name of this daemon, you have to create 2 conflicting > > packages bird-ipv4 and bird-ipv6. > > I see no problem in distributing bird as packages "bird" (with > /usr/sbin/bird), "bird-ipv6" (providing /usr/sbin/bird-ipv6) and > "bird-doc" providing the documentation. No conflicts there. > Could you please make this change in your package? I mean, when generating bird-ipv6 call it bird-ipv6 and make it read config file etc/bird-ipv6.conf and use different socket for communication with bird client. I have also got a comment about export and import keywords. I don't think it is a good idea to call it this way. These keywords are a part of protocol statement, so "export" semantic is to export routes originating in this protocol to routing table - you call it "import". It is really confusing me. -- ------------------------------------------------------------------------- David Rohleder davro(a)ics.muni.cz Institute of Computer Science, Masaryk University Brno, Czech Republic -------------------------------------------------------------------------

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Re: OSPF and IPv6
by David Rohleder 28 Feb '01

28 Feb '01

Martin Mares <mj(a)atrey.karlin.mff.cuni.cz> writes: > Hello! > > > So, you call protocols outside world? Did i understand correctly? > > No, I call everything outside BIRD the "outside world". > > > Your point of view is developer's. You see "core" routing table as a > > main part of bird. But as a user I see protocols as a main part of > > bird. > > No, my point of view is user's -- I see bird as a single entity and I don't > look at its internals. By exporting I mean sending from bird to other > routers via the protocol instance we're just configuring. No need to > distinguish which part of bird is the "inside" and which is "outside" > -- all parts are "inside". Bird user's guide part 3.3: import all | none | filter | where ... Specify a filter to be used for filtering routes coming from the protocol to routing table. export - opposite Here i can see bigger distinction between protocol and routing table, than between protocol and other router. Not all of the protocols have something in common with another routers (kernel and device) I am really confused. May be there si something wrong with doc? Please explain following example: protocol kernel { export all; } Does this mean, that protocol kernel tries to update bird's routing table according to changes in kernel routing table? Or does this mean, that bird tries to update kernel routing table according to changes in bird's routing table? Hmm, it seems i got it: "export" in case of normal routing protocol means routes which will be send to other routers (as i have understood from example 6.1.4). This is what i prefer, but explanation in user's guide is IMHO wrong. import all | none | filter | where ... Specify a filter to be used for filtering routes coming from the protocol to routing table. ^^^^^^^^^ change to "another routers"? -- ------------------------------------------------------------------------- David Rohleder davro(a)ics.muni.cz Institute of Computer Science, Masaryk University Brno, Czech Republic -------------------------------------------------------------------------

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Re: OSPF and IPv6
by David Rohleder 27 Feb '01

27 Feb '01

Martin Mares <mj(a)ucw.cz> writes: > > > I have also got a comment about export and import keywords. I don't > > think it is a good idea to call it this way. These keywords are a part > > of protocol statement, so "export" semantic is to export routes > > originating in this protocol to routing table - you call it > > "import". It is really confusing me. > > Agreed. The problem is that the situation is completely symmetric, so any > naming you choose has to be a bit confusing -- it's the same as defining > left and right hand. > > We have chosen "bird-centric" view, hence "export" means "export from > bird to the outside world" and "import" the opposite. So, you call protocols outside world? Did i understand correctly? I agree, that situation is quite symmetric, but when you are inside (protocol definition) then export means "go out of here" (to routing table). Your point of view is developer's. You see "core" routing table as a main part of bird. But as a user I see protocols as a main part of bird. This is certainly caused by configuration file, because there are not configuration commands for "core" routing table. PS: is that list who sends your letter to me and copy to the list, or is that you? -- ------------------------------------------------------------------------- David Rohleder davro(a)ics.muni.cz Institute of Computer Science, Masaryk University Brno, Czech Republic -------------------------------------------------------------------------

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Re: OSPF and IPv6
by David Rohleder 26 Feb '01

26 Feb '01

Martin Mares <mj(a)atrey.karlin.mff.cuni.cz> writes: > Hello! > > > Sorry, but i don't want OSPFv3, but OSPFv2 for IPv4 and another > [snip] > > but I can't see any reason for this. > > > > Hmmm, when I enable IPv6, then IPv4 is disabled? Why? > > The reason is that Linux/IPv4 and Linux/IPv6 are two substantially > different ports. > > Unless you want to exchange routes between IPv4 and IPv6 which is > very unlikely, you can run two separate instances of bird, one for > IPv4 and one for IPv6. > Yes, and have 2 binaries for those protocols. Very funny. :-( I don't see any reason to make 2 binaries, when architecture of your programm can easily support both protocols. Otherwise, there should be 2 binaries with different names - because they do 2 different things. bird-ipv4 and bird-ipv6 Think about adding BIRD to for example Debian distribution. If there is only one name of this daemon, you have to create 2 conflicting packages bird-ipv4 and bird-ipv6. -- ------------------------------------------------------------------------- David Rohleder davro(a)ics.muni.cz Institute of Computer Science, Masaryk University Brno, Czech Republic -------------------------------------------------------------------------

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Re: OSPF and IPv6
by David Rohleder 26 Feb '01

26 Feb '01

Ondrej Feela Filip <feela(a)ipex.cz> writes: > On 25 Feb 2001, David Rohleder wrote: > > > > > Hello, > > Hello, > > > > > is there a chance to use both OSPF for IPv4 and IPv6 with another > > protocol (as OSPFv3 is not implemented yet)? > > Nope. :-( OSPFv3 is not implemented. I plan to implement it. Sorry, but i don't want OSPFv3, but OSPFv2 for IPv4 and another protocol for IPv6. This piece of code is self explaining: if test "$enable_ipv6" = yes ; then ip=ipv6 if test "$with_protocols" = all ; then with_protocols=bgp,pipe,rip,static fi else ip=ipv4 if test "$with_protocols" = all ; then with_protocols=bgp,ospf,pipe,rip,static fi fi but I can't see any reason for this. Hmmm, when I enable IPv6, then IPv4 is disabled? Why? -- ------------------------------------------------------------------------- David Rohleder davro(a)ics.muni.cz Institute of Computer Science, Masaryk University Brno, Czech Republic -------------------------------------------------------------------------

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OSPF and IPv6
by David Rohleder 26 Feb '01

26 Feb '01

Hello, is there a chance to use both OSPF for IPv4 and IPv6 with another protocol (as OSPFv3 is not implemented yet)? BTW: what are official languages of this group? -- ------------------------------------------------------------------------- David Rohleder davro(a)ics.muni.cz Institute of Computer Science, Masaryk University Brno, Czech Republic -------------------------------------------------------------------------

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[newbie] shanim vzorovou konfiguraci
by David Trcka 26 Feb '01

26 Feb '01

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Zdravim, inspirovan prednaskou na SLT2001, trosku si hraju s BIRDem. Bohuzel slozitost konfigurace jednotlivych protokolu je dost velka na to, abych to z fleku rozchodil bez problemu. Proto hledam nejaky vzorovy konfiguracni soubor, takovy nejaky "plug'n'play" na OSPF. Abych ho mohl dat na vsechny routery (pokud mozno bez lokalnich zmen - prozatim) a ono by to fungovalo. Zkousel jsem neco zplodit sam, ale nefunguje to tak, jak bych ocekaval. Topologie: LAN 192.168.1.0/24, pripojene 2 PC, v kazdem 2 sitovky, jedna do LAN, druha mimo (10.0.1.0/24 resp. 10.0.2.0/24). Ocekavam: na kazdem z tech PC uvidim routu na externi sitovku toho druheho a po odpojeni nektereho z nich ty routy zase zmizi Vysledek: na kazdem z tech PC se sice objevi routa na 10.0.neco toho druheho, ale po jeho odpojeni nezmizi. Moje konfigurace: debug protocols all; protocol direct { interface "*"; } protocol kernel { persist; scan time 20; export all; import all; } protocol device { scan time 10; } protocol static { } protocol ospf { area 0.0.0.0 { interface "eth*" { }; }; export all; import all; } V syslogu vypisuje neco jako "route 10.0.2.0/24: seen" a nevyhodi ji pryc. Nebo to mozna trva moc dlouho na to, abych se dockal :) Dal by se nekde sehnat nejaky vzor, ktery dela to, co ted pozaduju? Dik __________________________________________ David Trcka, network administrator PODA s.r.o., Internet Service Provider Ostrava, 28. rijna 150, The Czech Republic Voice/Fax: +420 69 6612600 PGP KeyID: DAE55DA4 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.1 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE6mi6A5z9w2trlXaQRAgmfAJ91CKuTa2oqZ9URjVd1zz7IG5+DFACggA+H HyPy1qTC/piVV8qQrkzUXaQ= =CmE5 -----END PGP SIGNATURE-----

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question about checksum.c
by Zheng Yuan {ZYUAN1} 20 Feb '01

20 Feb '01

Hi all In the func ipsum_calc_block(u16 *x, unsigned len, u16 sum) ASSERT(!(len % 2)); if (!len) return sum; len >>= 1; if ((unsigned long) x & 2) /* Align to 32-bit boundary, use x's address */ { sum = add16(sum, *x++); len--; } rest = len & 1; len >>= 1; tmp = 0; xx = (u32 *) x; Why do we have two len >>= 1; i understand it will change the xx to move 32 bits one time. Isnt that the first one redundant?

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Routing server traffic thru two external ips.
by Chuck Larson 20 Feb '01

20 Feb '01

Hi, I am new and would like to know if this is possible with bird. I currently have a game server setup behind a linux router/firewall which is hooked up to two cable modems via two NICS( eth0 and eth1 ). The idea is that if I have 12( or more ) players, how do I tell the kernel( with me telling using route ) TX packets to 6 players on eth0 and the other 6 on eth1. Any thoughts? Sincerely, Chuck Larson Linux newbie of 8 months _____________________________________________________________ Domain powered by www.iReg.com E-mail powered by www.1FreeEmail.com

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