Есть Cisco 2610 с двумя 2-ух портовыми E&M. В них, соответственно, воткнуты четыре телефонные линии. На них дозваниваются и выходят в инет. Настроен NAT.
Через некоторое время после соединения (может через пару минут, а может, если повезёт, то через часок-другой) пакеты через циску ходить перестают. Приходится отсоединяться и дозваниваться заново, на некоторое время помогает, потом опять то же самое.
В чём проблема?

sh ver

Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.2(11)T2,  RELEASE SOFTWARE (fc1)

TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Sun 13-Oct-02 20:27 by ccai
Image text-base: 0x8000809C, data-base: 0x80A68468

ROM: System Bootstrap, Version 12.2(7r) [cmong 7r], RELEASE SOFTWARE (fc1)

2610 uptime is 14 hours, 51 minutes
System returned to ROM by reload at 19:27:25 MOSCOW Wed Aug 20 2003
System restarted at 19:30:03 MOSCOW Wed Aug 20 2003
System image file is "flash:c2600-i-mz.122-11.T2.bin"

cisco 2610XM (MPC860P) processor (revision 0x100) with 28672K/4096K bytes of mem
ory.
Processor board ID JAD064005AE (1462282737)
M860 processor: part number 5, mask 2
Bridging software.
X.25 software, Version 3.0.0.
1 FastEthernet/IEEE 802.3 interface(s)
4 Serial network interface(s)
4 terminal line(s)
32K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

sh conf

Using 2407 out of 29688 bytes
!
! Last configuration change at 19:24:36 MOSCOW Wed Aug 20 2003 by dm
! NVRAM config last updated at 19:27:09 MOSCOW Wed Aug 20 2003 by dm
!
version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname 2610
!
logging buffered 500000 debugging
aaa new-model
!
!
aaa authentication login default group radius enable
aaa authentication ppp default if-needed group radius
aaa authorization network default group radius
aaa session-id common
enable secret 5 *******************
enable password *******************
!
username ******* password 0 *******

ip subnet-zero
!
!
ip name-server *.*.*.*
!
!
!
!
!
interface FastEthernet0/0
bandwidth 10000
ip address 62*.*.*.* 255.255.255.248
ip accounting output-packets
ip nat outside
ip route-cache same-interface
ip route-cache policy
ip route-cache flow
speed 10
full-duplex
!
interface Group-Async1
bandwidth 1000
ip unnumbered FastEthernet0/0
ip nat inside
encapsulation ppp
ip route-cache policy
ip route-cache flow
ip tcp header-compression
async mode interactive
peer default ip address pool setup_pool
ppp authentication eap ms-chap chap
group-range 1 4
!
ip local pool setup_pool 192.168.50.1 192.168.50.5
ip nat inside source list 90 interface FastEthernet0/0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0 62.*.*.*
ip http server
!
!
logging trap debugging
logging 62.*.*.*
access-list 90 permit 192.168.50.0 0.0.0.255 log
dialer-list 1 protocol ip permit
dialer-list 1 protocol ipx permit
snmp-server community public RO
snmp-server enable traps tty
radius-server host 62.*.*.* auth-port 1645 acct-port 1646
radius-server retransmit 3
radius-server key *********
radius-server authorization permit missing Service-Type
!
line con 0
line 1 4
flush-at-activation
modem Dialin
autoselect during-login
autoselect ppp
stopbits 1
speed 115200
flowcontrol hardware
line aux 0
line vty 0 4
password **********
length 0
!
end