Cisco 827 e IRC

[porkyHTTP]

Salve a tutto il forum,
da venerdì ho un c827 con 8F/32R equipaggiato con ios c820-oy6-mz.123-3a.bin. Il router è configurato per una connessione Alice Flat 640. Quello che mi capita è che quando sono connesso ad IRC, dopo un tempo che varia da 5 a 20 minuti, cade la connessione al server irc. Dato che uso il mulo, l'ho configurato con max 100connessioni, up 11kb. nonstante questo, il problema relativo ad IRC resta. Di seguito riporto l'attuale configurazione, vi chiedo di visionarla in cerca di errori e per miglioramenti.

**************************************************
!
version 12.3
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname c827
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$PQrF$OWv71aZ3DsQjECMwH8add/
!
no aaa new-model
ip subnet-zero
no ip domain lookup
ip name-server 151.99.125.2
ip name-server 212.216.112.112
ip dhcp excluded-address 192.168.0.1 192.168.0.5
!
ip dhcp pool LAN
network 192.168.0.0 255.255.255.0
default-router 192.168.0.1
dns-server 151.99.125.2 212.216.112.112
domain-name alessandro-pensato.it
lease 0 12
!
!
!
!
interface Loopback0
ip address 10.0.0.1 255.255.255.0
!
interface Ethernet0
description Interfaccia Ethernet0/0 - Lan interna
ip address 192.168.1.1 255.255.255.0 secondary
ip address 192.168.0.1 255.255.255.0
ip nat inside
hold-queue 100 out
!
interface ATM0
description Interfaccia ATM0/0 - Connessione ADSL
no ip address
no atm ilmi-keepalive
pvc 8/35
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
dsl operating-mode ansi-dmt
hold-queue 224 in
!
interface Dialer0
description Interfaccia Dialer0/0 - Alice ADSL Flat 640
ip address negotiated
ip nat outside
encapsulation ppp
dialer pool 1
ppp authentication chap callin
ppp pap sent-username aliceadsl password 7 050A0A0622494F0D0A09
!
ip nat translation timeout 420
ip nat translation tcp-timeout 360
ip nat translation pptp-timeout 420
ip nat translation udp-timeout 360
ip nat translation syn-timeout 10
ip nat translation dns-timeout 10
ip nat translation icmp-timeout 30
ip nat translation port-timeout tcp 4663 60
ip nat translation port-timeout tcp 4662 60
ip nat translation port-timeout udp 4672 60
ip nat translation port-timeout udp 4673 60
ip nat translation max-entries 1000
ip nat inside source list 1 interface Dialer0 overload
ip nat inside source static udp 192.168.0.4 4673 interface Dialer0 4673
ip nat inside source static tcp 192.168.0.4 4663 interface Dialer0 4663
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
access-list 1 permit 192.168.0.0 0.0.0.255
access-list 1 permit 192.168.1.0 0.0.0.255
snmp-server community public RO
snmp-server trap-source Ethernet0
snmp-server location Home Router
snmp-server contact Alessandro Pensato
snmp-server enable traps tty
snmp-server host 194.119.211.160 public
!
line con 0
logging synchronous
transport preferred all
transport output all
stopbits 1
line vty 0 4
access-class 1 in
password 7 060B0E335C471C1700
logging synchronous
login
transport preferred all
transport input all
transport output all
!
scheduler max-task-time 5000
!
end