I confirm that there is a problem.
This is with Rails 3.1.0rc8

$ rails new test_ip
$ cd test_ip
$ rails generate model MyModel ip:string description:string
$ rake db:migrate
$ rails generate controller Writer write_records

app/controllers/writer_controller.rb:

class WriterController < ApplicationController
  def write_records
    MyModel.create!(:ip => request.remote_ip, :description => 'request')
    MyModel.create!(:ip => '127.0.0.1', :description => 'string')
  end
end

$ rails s

go to
http://localhost:3000/writer/write_records

$ rails c

> MyModel.all
  MyModel Load (0.2ms)  SELECT "my_models".* FROM "my_models"
 => [#<MyModel id: 1, ip: "127.0.0.1", description: "request", 
created_at: "2011-08-30 09:42:09", updated_at: "2011-08-30 09:42:09">, 
#<MyModel id: 2, ip: "127.0.0.1", description: "string", created_at: 
"2011-08-30 09:42:09", updated_at: "2011-08-30 09:42:09">]

> MyModel.where(:ip => '127.0.0.1').all
  MyModel Load (0.2ms)  SELECT "my_models".* FROM "my_models" WHERE 
"my_models"."ip" = '127.0.0.1'
 => [#<MyModel id: 2, ip: "127.0.0.1", description: "string", 
created_at: "2011-08-30 09:42:09", updated_at: "2011-08-30 09:42:09">]

> MyModel.first.ip == '127.0.0.1'
  MyModel Load (0.2ms)  SELECT "my_models".* FROM "my_models" LIMIT 1
 => true

In the database for the first ip i have: X'3132372E302E302E31'

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