From chas.owens at gmail.com  Sat Nov 29 07:19:39 2008
From: chas.owens at gmail.com (Chas. Owens)
Date: Sat, 29 Nov 2008 02:19:39 -0500
Subject: Trouble getting DNS to work
Message-ID: <58ce48dc0811282319x74a78ec2k845b8e95bec26ae9@mail.gmail.com>

I have two machines 10.2.4.3 (client) and 10.2.4.4 (server).
Eventually there will be a squid proxy between them, but I wanted to
get a working setup first.  Both are Ubuntu 8.10 and have Web
Polygraph 3.1.5.  10.2.4.3 also has Bind 9 installed.  I was able to
get simple.pg working between the two machines, so I started modifying
it to add the DNS functionality I will need.  I have run into a brick
wall.  I can query the DNS server and get answers back, but when I run
the test it spits back

000.00| Connection.cc:492: error: 1/1 (s111) Connection refused
000.00| error: raw write after connect failed
000.00| connection between 10.2.4.3:39591 and 10.2.4.4 failed at 0
reads, 0 writes, and 1 xacts
000.00| Connection.cc:492: error: 2/2 (s111) Connection refused
000.00| error: raw write after connect failed
000.00| connection between 10.2.4.3:60757 and 10.2.4.4 failed at 0
reads, 0 writes, and 1 xacts
000.00| Connection.cc:492: error: 4/4 (s111) Connection refused
000.00| error: raw write after connect failed
000.00| connection between 10.2.4.3:34961 and 10.2.4.4 failed at 0
reads, 0 writes, and 1 xacts

and so on.  When I say

dig @10.2.4.3 www.foo.com a

I get the expected

; <<>> DiG 9.5.0-P2 <<>> @10.2.4.3 www.foo.com a
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63922
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;www.foo.com.                   IN      A

;; ANSWER SECTION:
www.foo.com.            3600    IN      A       10.2.4.4

;; AUTHORITY SECTION:
foo.com.                3600    IN      NS      ns.foo.com.

;; ADDITIONAL SECTION:
ns.foo.com.             3600    IN      A       172.16.101.100

;; Query time: 0 msec
;; SERVER: 10.2.4.3#53(10.2.4.3)
;; WHEN: Sat Nov 29 02:12:46 2008
;; MSG SIZE  rcvd: 78

I am running

sudo polysrv --config simple.pg

on 10.2.4.4 and

polyclt --config simple.pg -verb_lvl 10

on 10.2.4.3

my simple.pg file is

AddrMap foo = {
    zone      = "foo.com";
    addresses = [ '10.2.4.4:80' ];
    names     = [ 'www.foo.com' ];
};
use(foo);

DnsResolver dr = {
    servers = [ '10.2.4.3:53' ];
    timeout = 5sec;
};

// SimpleContent defines properties of content that the server generates;
// if you get no hits, set SimpleContent.obj_life_cycle to cntStatic, which
// is defined in workloads/include/contents.pg
Content SimpleContent = {
        size = exp(13KB); // response sizes distributed exponentially
        cachable = 80%;   // 20% of content is uncachable
};

// a primitive server cleverly labeled "S101"
// normally, you would specify more properties,
// but we will mostly rely on defaults for now
Server S = {
        kind = "S101";
        contents = [ SimpleContent ];
        direct_access = contents;

        addresses = ['10.2.4.4:80' ]; // where to create these server agents
};

// a primitive robot
Robot R = {
        kind = "R101";
        pop_model = { pop_distr = popUnif(); };
        recurrence = 55% / SimpleContent.cachable; // adjusted to get 55% DHR

        origins = ['www.foo.com']; // where the origin servers are
        addresses = ['10.2.4.3' ]; // where these robot agents will be created
        dns_resolver = dr;
};

// commit to using these servers and robots
use(S, R);

-- 
Chas. Owens
wonkden.net
The most important skill a programmer can have is the ability to read.